My sons cozmo battery use to last 5mins and shut down, I saw John's video on battery replacement looked way complicated for me, got in touch with John for his services, sent cozmo to him on Friday and got it back a few days later, now cozmo battery lasts way over an hour and keeps going. Thank you John you're amazing gave a whole lease of life to the bot. My son absolutely loves it. Highly recommended to anyone needing battery replacement. Mohan
Our Cosmo kept disconnecting. After some troubleshooting we figured the battery wasn't holding a charge. Sent it to John Judge and now our Cosmo's as good as new. Many thanks John!
Excellent tutorial but a little over my capabilities and I was worried I will not be able to put him back together properly. So instead, I used the service that John provides and we already have Cozmo back to life and working perfectly. We sent it by post to John and received it back within a few days, it really was a great service; highly recommended!
I highly recommend John's replacement service as we purchased our Cozmo second hand and the battery was pretty much dead from the start. After watching this video, I opted to take out Johns offer to replace the stock battery with the upgraded battery. I posted it to John on a Friday afternoon and my cosmo was back Tuesday morning. Excellent service and value for money. Thank you so much John Judge :) 10/10
Just finished replacing the battery in my son’s Cozmo. Took me about an hour and turned out great 👍 Your other video with the more detailed soldering information was very helpful as well. Thanks so much, he’s so happy to have that little guy back 😊
Thanks for the video. I was able to change the battery. My little girl is happy! I did not find a 503040 lipo near where I live, but I replaced it with a 403035 lipo 450 mAh. It does the job! Most tricky part was to reassemble the head i think.
Hi John. Just wanted to say thank you for this post. I was gifted a sickly Cozmo who could only handle a few minutes of play and decided to risk surgery on him. Got a new battery and followed your guidance to get him apart. My soldering skills are not that good so I didn't risk touching the circuit board and instead went with cutting the wires as close to the dead battery as possible then exposing the core. I twisted the new wires on gently and then added blob of solder and electrical tape to project them. All went back together and now have a fully functioning Cozmo who handled an hour plus earlier with no sign of red on his back. Couple things I noted as I went through the process, it takes more force than seems right to get the "geared" arm off. I could see how the "key" worked and I was at the right angle but it just didn't want to let go! Re-assembly of the head was also very tricky. I didn't clock at first that the bars that the screws connect into have a way around - both in terms of left/right and the shaped ends that go into the right hand side of his head (where the spring is). In the end I found it best to attach those end first, then slide the LED over the lower bar, align the top bit and the windscreen and then screw the left side of his head on last. He is a very cute little thing now he works fully!
Hey Simon! Thanks for your reply! I love reading stories like this. I agree on the two points you make - I think I gloss over them in the video but will definitely revisit and make a clearer demonstration for future reference. The gear arm has a definite pop when removed, which can be daunting the first time. And the head is also very fiddly when having to line up the tubes and spring to get the assembly back together. Great to hear that you got your unit running around again!
Hi John, just wanted to say thanks for your videos on this. I bought Cozmo before my daughter was born and by the time she was old enough to really enjoy him the battery was only giving 5-10 minutes. I have been promising her for months to replace the battery and she always loves watching your videos and reminding me. Today I got around to it and your videos were very helpful. My daughter new what to do from memory from your videos and was giving me tips. (She is four next month) Cozmo is back together with a new 600 mah battery and currently charging nicely. Happy daughter. Thanks.
This is amazing! You've made my day with your kind words! I'm glad you got the robot working again (sounds like you had great tech support from your daughter!) Thanks! and Well Done!
Thanks for this awesome tutorial! Not used to working on things as small as Cozmo but managed it with some patience. The old battery was so swollen! He runs around for ages now.
Hi John, Thank you for the nice explanation in the video about replacing the Cozmo battery. After 5 years of running the battery was at 30 % and I bought a new one and replaced it without any problem thanks to your video. Great the kids from Croatia
I bought Cozmo used and it tended to randomly shut down very frequently. I excluded battery problems because by repositioning it in its base it immediately returned ready to go again. I've been thinking about issues with wifi disconnecting or any interference but I've noticed that when cozmo loses wifi connection it doesn't tend to shut down immediately. So I followed this guide and opened it up and found a lot of rust between the electrical contacts, as well as in the 5 minute video. I easily cleaned everything up with isopropyl alcohol and now it seems to work fine.
Excellent video John! I think that most skilled hobbyists could perform this repair. A few words of caution, however: when you feed the new battery cables, they are typically "live" and have the potential of damaging the circuit or components if they happen to touch any circuit area and make a connection prior to the exact points where they need to be soldered. It may be helpful to snip each new battery lead so that only the insulated wire is fed through, and then stripped just prior to soldering. Additionally, rosin left on the circuit board after soldering can cause problems: usually, 90% isopropyl alcohol and a cue-tip should be used on the soldering joint to remove any excess rosin that pools around the connection. The final job should be clean, shiny, and rosin-free. Finally, the original Li-Po battery is still potentially dangerous because the battery can still hold a residual charge. The leads should not be shorted, they should be snipped off, and the old battery disposed of properly in a recycling facility. A shorted or swelling Li-Po battery can explode and/or cause a surprisingly spectacular fire (see RUclips LiPo battery explosions for examples of what can go wrong).
Thanks Jim! Excellent points here. I am in the process of making a short video dedicated to the soldering process and I will use your comment as the basis of the talking points. Over time I’ve developed a safer way of installing the battery in line with your points- you have encouraged me to get it finished.
I have no soldering tools or the patience for such ‘fine’ assembly procedures so I enlisted the services of John Judge to replace the battery in my son’s failed Cozmo unit. My son is now very happy as John carried out the replacement battery change with superb results as Cozmo now has more power via charge than he ever did ! For anybody that may be needing a similar fix/repair to Cozmo I thoroughly recommend the services of John Judge. Very swift service and excellent communication. Thank you John 👍 +1 upvote
Bob Hope - He is located on the Isle of Man UK 🇬🇧 ( I am also UK resident ) Duration between sending and receiving back was no longer than a week.... and this was also during the xmas/new year festive season notoriously slow for postal services so I was very impressed.
Great tutorial! Thank you so much for doing this! I just replaced the battery in my son's Cozmo and your directions helped tremendously. Found the battery on Amazon for $15, perfect fit and twice the capacity. The head is a little tricky but I found if you only remove 3 of the 4 screws, and leave in the lower left screw, it will hold that little plastic rod in place making it easier to go back together. I accidentally left out the counterweight the first time so I got to tear it apart twice! Also the trick with the arms is there is a little tab or clip that you can barely see but if you lift the arms all the way up becomes visible that you want to push in so it releases. I didn't quite see that in the video, they don't just pop off, you have to press in that little white tab, just in case others have the same question. Thanks again! Cozmo is up and running like new.
Thanks for this, I got my Cozmo battery replaced. Yes it's a lot of steps, the battery is deep down at the bottom of the build pile. Once you get down there it's very easy to replace the battery. The hardest part of the whole mess was getting the head back together. I felt like I could use a 3rd hand. In the end the trick there is to get the screen in, then put the two halves of the head back together almost all the way, maybe even thread on of the screws in 2 turns, then clip the face plate and the speaker back in place.
Thank you so much for that video. You did not only safe our cozmos life, you made the twins quite happy, as they now are old enough to get a lot of fun about the interaction with >daddys(!)< toy. The first testrun (man, I was nervous!) after the operation gave a solid 2+ hours playtime. I myself more confidence in fixing things before just bringing them to the next bin.
sdhpCH Thank You! This makes me happy. You should feel proud of yourself for completing this repair. You now have the knowledge and experience to keep Cozmo alive forever.
Thank you, John. This video is a huge help to me! Our Cozmo was down to about 8-10 minutes of runtime per charge. Replaced the battery and now our Cozmo has new life! I would caution everyone that the larger mah batteries are longer and that the biggest possible battery is not automatically best. We replaced with a 620mah and it rests against the front bottom sensor. Everything seems to work well, but it's a very tight fit. The 540s or 600s would likely be better overall fit but you can squeeze the 620 mah in there.
Thank you very much for your detailed video. The original battery was not holding a charge I did the upgrade yesterday and my son can now play with Cozmo again. Cozmo lasted more than 2 hours. My son is very happy :-)
Great video and a very helpful man! I replaced the battery with no problems with this video but still had no response from Cozmo apart from a flashing green light on its back. I emailed John and within minutes he replied and advised me about wifi signals blocking Cozmo. I will admit I didn't see how this would affect Cozmo from turning on but after turning off my Wifi mesh Cozmo came to life! Thanks again John! I would've bought another one off ebay if it wasn't for you. Much appreciated. Mark.
Thanks to you the little digital friend of my son now has again full power. The old battery only had 5 minutes of playtime left. Thumbs up, great video!
This is a fantastic guide. I’ll admit it - I was worried I’d be sending John a bag of parts to fix, but it worked! With John’s guidance, I did it! My son is ecstatic. Thanks, John!!
Hi John. My sons Cozmo shows no response when placed on the charger. Not sure if this is a battery issue. I would like to send Cozmo to you for repair if it is determined that the battery is the culprit. Thank you. How do I get an address to send?
Very helpful video, thank you for sharing this and the info on the replacement battery! My daughter is so thrilled to have her friend back. I did two swap outs back to back, and did find it easier to reassemble the second cozmo by removing the head screws only on his left side. This kept the internal screw rods in place, and reduced the tricky head reassembly from ten angry minutes to one slightly annoying minute. Hope that helps!
Excellent! I always nice to read these stories - thanks for the top-tip on the head assembly (I'll probably make a new video showing what you described; it will no doubt make reassembly much quicker!
Thankyou for this tutorial :D I'm not good with my hands at all but this video (+ alot of time) made me fix my cozmo. He's recharging rn, thankyou for this amazing video :)
Thank you very much for your detailed video. I did the upgrade yesterday and now, Cozmo can play more than 2 hours (132 minutes), it's amazing, thank you again :)
Thanks! Great to hear this helped. Ideally I’d like to form a list of repairers around the world to help others out. Many people live outside the U.K. and need this service.
Thanks @@TheJohnJudge one comment on tha way I did it. Like another comment I saw today, i was not confident enough on my soldering skill to directly attack the circuit. I just cut the existing wires and solder the new battery on them. Worked like a charm.
Thanks for the video, upgraded the battery, everything lights up but that’s about it, can’t reset and the WiFi password isn’t recognised so some nice scrap !
My Cozmo dies pretty quick. I was curious on how to fix the battery and this really helped. Unfortunately I’m not certain that I own a soldering iron to complete this repair, so I was curious to see how much it costs to send in my Cozmo and have it fixed.
I just found my anki cozmo during a recent move after not seeing it for a few years, and the battery is dead. I feel confident in following your instructions, I just wanted to check what the dimensions for the battery are? I don't want to order one that is too big. Thanks!
Thanks so much! My youngest wants to play with Cosmos after a hands off from his older sister but it keeps getting disconnected after 5min and we can restart it again and repeat. Not sure if it is battery related but I will get a new battery pack from your link just in case as I tried everything from the anki website. Too bad it is no longer supported. Love this little guy! Thanks again for your great video. Subscribed!
My cozmo doesn't make any sound after I put him back together I'm tempted to see if anything was left unplugg but I made sure it wasn't all I hear if mechanical and the battery is new
I will make a video on this issue. It means his the wire connecting his speaker (which is als his WiFi aerial! To his head has come loose and needs to be soldered back.
Ok. I could do it but would recommend you join the Official Digital Dream Labs Cozmo Page on Facebook as I know there are US peeps that could help you out also.
I tried to unwire the battery but my cozmo got way to much solder on it and it wouldnt come off so i used scissors to cut the battery off and put in my new one i soldered the cables together still red lighting button but loading works im not sure if its entirely broken or i just need to redo that battery wiring somehow
Firstly, allow me to explain the meaning of the 6 digit part number of the battery 503236. The first digit is the thickness of the battery, 50 = 5mm (60 = 6mm and so on. If the first number is, say, 55 then that would be 5.5mm). The second digit is the width, 32 = 32mm wide. The last digit is the length, 36 = 36mm long. I really can't understand how people think can they get that much more mah from a battery that is damn near the same size? It is simply not possible. It's the amount of chemicals inside the single cell "Package" (Size) that gives it the mah rating. Therefore, you MUST use a larger battery to get more mah, period. Your comparison is the same thickness, but a 2mm narrower and a 4mm longer battery. Actually only making it a total difference of 2mm larger. 2mm does not equate to almost twice the mah rating.The Chinese are notorious for their misleading and lying to people about their products. This is one of those times. Another example of this is, "You cannot fit two gallons of baby shit into a one gallon bucket". Another thing about it that might surprise you is, Cozmo's original battery lasted maybe 30 minutes, more or less. If you replace it with a 30% larger battery, you will get 9 minutes, more or less, longer. I know, right? 30% sounds like a lot, but it isn't really that much. So, when DDL tells you that the new Cozmo 2.0 will give you up to 30% longer runtime, now you know. The "up to" is because this is just an approximation. Due to the amount of chemicals not being equal in each battery. Also, Due to the location of the battery, it is only possible for a certain size battery to fit. So, this means that a new battery that will give you 30% longer runtime, is the largest battery that will fit in the allocated space. i'm sure they would have made it an even larger battery, giving you even more runtime, but it is more than likely because Cozmo would get a lot hotter, that they didn't even consider it. So, in conclusion, the chances are that this so-called 600 mah battery is probably twice the price. But not twice the runtime. Now, if you could fit 2 batteries connected in parallel, you would get twice the runtime, common sense and logic dictates this. This also proves that you cannot get twice as many mah from approximately the same size single cell battery. Just trying to help people that really don't understand how Li-Po batteries work.
I’ve been confirmed by anki (ex)technician that the spring into the head is usueless for any Cozmo of the latest gen, the one with the button on the back. It is tricky to put it back, if your Cozmo has a button just leave it out.
I followed the video and replaced the battery, but the Cozmo shows "cozmo wants to be put down" now and the head is keep moving up and down while the lift never moved. Do you know which sensor maybe damaged during I replacing the battery? When assembly the cozmo back, do I need calibrate head and lift position?
Hi there. My cozmo screen is very dull and cannot find anyway to adjust the brightness or information online as to how to fix this... Would you be willing to upgrade the battery for me as mentioned in your video? Many thanks in advance!
I did the replacement a few days ago and woke him up today and he lasted as long as he did before the replacement, whereas earlier today he was going for ages! Any suggestions?? 😰😰
Do you have a wifi mesh system or signal booster attached to your router? strong wifi signals on the 2.4GHz channel can overpower Cozmo's aerial and cause it to shut down (which show the same symptoms as a bad battery)
Thanks so much for this tip but we don’t have a signal booster. 😕 He did last a lot longer when we tried him again earlier, do you have any other reasons why the battery would die so much sooner than is estimated? (He has been on charge for at least 1 hour and also you are one of the best repair youtubers I’ve EVER watched as you make very detailed tutorials and whenever something is wrong with our cozmo, we can always come over to your channel and you have a tutorial on how to fix it! You’re an absolute legend and there is no reason why you should have dislikes on any of your videos as they are a ‘live saver for our little cozmo!’ 😄😄😄😄
Regarding the rubber sticker on the battery, how necessary would it be to transfer over to the new battery from the old one as I have found others say it serves as a thermal insulator between the motherboard contacts under the battery and the battery itself and if so what issues could arise from this?
I think it predominantly prevents any components on the motherboard from piercing the battery sleeve (they’re quite sharp). Also I guess it stops the battery sleeve accidentally shorting any components because it does rest on top of them.
Hi, I'm not able to find the 503040 lipo where I live, instead I was able to find a 900 mah 603048 lipo battery. It is about 1 mm thicker and 8 mm longer than the 503040. Will it fit or should i look for a different one? Thank you for you help.
Hi,I have a new battery and have stripped the Cozmo down but didnt realise the battery needed to be soldered,can i send it to yiu to replace and re assemble - can you message with a price please?
Hey there, just found your Video AFTER i replaced the battery by my own xD (used an 620mAh from Amazon). Question: Cozmo is again up and running, so far its fine. The Problem: He dont know when the battery is low and just turns off after an hour or so being on his ride. When he is charging the 3 LEDs jump after a hour or so just from 1 LED to 3 LEDs --> Full. Is there a way to "learn" on the new Battery or should it work just out of the box? Didnt Factory reset Cozmo - maybe thats the fault? Best regards from Germany, Marti
Hi, I sent you an email earlier today about fixing my Cozmo, and hopefully replacing the old battery which lasts for 5 mins with a better one. I was wondering if you are still able to do that for me. Thanks!
Hi. I would like to ask you if you know anything about why Cozmo does not speak. The unit was dropped and it just stopped speaking. Please if you have a way to fix it please let me know.
Yes, I can make a video - the speaker in the top of the robots head is connected to the screen/face - a drop could mean that cable has broken off the PCB
I've just followed this guide and upgraded my cozmo's battery which has worked fine thank you. When resyncing it with the tablet and during the tutorial with cozmo trying to find the cubes his head just flips up and down constantly unable to find the cube. The cubes are flashing blue but it can't find them. any ideas?
John: My son just got a used Cozmo. I was hoping I could send you the unit for battery replacement. The device charges for a few minutes and says the battery is full. A few minutes later the battery is dead. I’m sure the seller was aware of this. Any help would be much appreciated.
Hello! I have attempted this repair myself, but struggled somewhat with the soldering. The battery connected to the robot, however I am not able to charge the battery on the the stand. It shows charging but never fully charges and just times out. Played with the robot for an afternoon with the charge the battery arrived with, but not getting any additional charge. Is this from the soldering or possibly not reassembling correctly? Can you give me any advice? Thank you.
Same question. I put my iron on the usual recommended 350 but have to push really hard on the solder to start melting it. What temperature is recommended ?
Ok I might want you to fix it for me. I've got a couple questions. First, I'd like to know how much the service of you fixing it costs. Also, I disassembled my Cozmo all the way already, so would it be okay if you fixed it from there?
Hi John Where exactly are you based and are you still doing this? I have a Cozmo and the battery doesn't hold charge and I want to revive him. Can you help?
Hi, I bought an Anki Cozmo November 2019 for my grandson. It will now no longer connect to Wi-Fi. I want to email John Judge for any advise he may have but the email address that was listed on a page is not being recognised. Can anyone advise on how to get in touch with John please
Hello. May you please contact me about your rate to replace a battery in a Cozmo? It was purchased second hand, but did not work after trying to charge it. Thank you, Roman
i changed my battery just like in this tutorial and it will claim to charge but when i pulled it off the charger when it said it was done. it would not turn on. i got it to turn on while it was on the charger but nothing would move
Hi there, could you give the link for where you get your batteries from? I'm outside of the UK so i cant buy directly from you on ebay but id like the exact battery you have. thanks
My sons cozmo battery use to last 5mins and shut down, I saw John's video on battery replacement looked way complicated for me, got in touch with John for his services, sent cozmo to him on Friday and got it back a few days later, now cozmo battery lasts way over an hour and keeps going. Thank you John you're amazing gave a whole lease of life to the bot. My son absolutely loves it. Highly recommended to anyone needing battery replacement. Mohan
How did you contacted him?
Our Cosmo kept disconnecting. After some troubleshooting we figured the battery wasn't holding a charge. Sent it to John Judge and now our Cosmo's as good as new. Many thanks John!
Excellent tutorial but a little over my capabilities and I was worried I will not be able to put him back together properly. So instead, I used the service that John provides and we already have Cozmo back to life and working perfectly. We sent it by post to John and received it back within a few days, it really was a great service; highly recommended!
I highly recommend John's replacement service as we purchased our Cozmo second hand and the battery was pretty much dead from the start. After watching this video, I opted to take out Johns offer to replace the stock battery with the upgraded battery. I posted it to John on a Friday afternoon and my cosmo was back Tuesday morning. Excellent service and value for money.
Thank you so much John Judge :) 10/10
i can't see the buy option tho?
do i email him?
edit: holy crap my parents cant pay 41 dollars for repair
Have you got contact details for john
Just finished replacing the battery in my son’s Cozmo. Took me about an hour and turned out great 👍
Your other video with the more detailed soldering information was very helpful as well.
Thanks so much, he’s so happy to have that little guy back 😊
hello! are you open to repairing one for a cost? I need to fix my son's Cozmo and all this welding is not something I can do. Thanks!
@@jen3028 Is it just the battery that needs replacement? What's the best way to contact you?
@@buccianti yes it will not hold a charge. gmail - jenhellenberg@gmail.com
Thanks for the video. I was able to change the battery. My little girl is happy! I did not find a 503040 lipo near where I live, but I replaced it with a 403035 lipo 450 mAh. It does the job! Most tricky part was to reassemble the head i think.
I was able to replace little cosmo’s battery with your help, and my sons tears turned to smiles and giggles. Thank you!
That’s great to hear! Well done!
Hi John. Just wanted to say thank you for this post. I was gifted a sickly Cozmo who could only handle a few minutes of play and decided to risk surgery on him. Got a new battery and followed your guidance to get him apart. My soldering skills are not that good so I didn't risk touching the circuit board and instead went with cutting the wires as close to the dead battery as possible then exposing the core. I twisted the new wires on gently and then added blob of solder and electrical tape to project them. All went back together and now have a fully functioning Cozmo who handled an hour plus earlier with no sign of red on his back. Couple things I noted as I went through the process, it takes more force than seems right to get the "geared" arm off. I could see how the "key" worked and I was at the right angle but it just didn't want to let go! Re-assembly of the head was also very tricky. I didn't clock at first that the bars that the screws connect into have a way around - both in terms of left/right and the shaped ends that go into the right hand side of his head (where the spring is). In the end I found it best to attach those end first, then slide the LED over the lower bar, align the top bit and the windscreen and then screw the left side of his head on last. He is a very cute little thing now he works fully!
Hey Simon! Thanks for your reply! I love reading stories like this. I agree on the two points you make - I think I gloss over them in the video but will definitely revisit and make a clearer demonstration for future reference. The gear arm has a definite pop when removed, which can be daunting the first time. And the head is also very fiddly when having to line up the tubes and spring to get the assembly back together. Great to hear that you got your unit running around again!
Hi John, just wanted to say thanks for your videos on this. I bought Cozmo before my daughter was born and by the time she was old enough to really enjoy him the battery was only giving 5-10 minutes. I have been promising her for months to replace the battery and she always loves watching your videos and reminding me.
Today I got around to it and your videos were very helpful. My daughter new what to do from memory from your videos and was giving me tips. (She is four next month) Cozmo is back together with a new 600 mah battery and currently charging nicely. Happy daughter. Thanks.
This is amazing! You've made my day with your kind words! I'm glad you got the robot working again (sounds like you had great tech support from your daughter!) Thanks! and Well Done!
Thanks for this awesome tutorial! Not used to working on things as small as Cozmo but managed it with some patience. The old battery was so swollen! He runs around for ages now.
Great work!
Definitely nothing for shaky hands but well explained, John! Did the trick for our Cozmo in about an hour. 👍
Hi John,
Thank you for the nice explanation in the video about replacing the Cozmo battery. After 5 years of running the battery was at 30 % and I bought a new one and replaced it without any problem thanks to your video. Great
the kids from Croatia
I bought Cozmo used and it tended to randomly shut down very frequently. I excluded battery problems because by repositioning it in its base it immediately returned ready to go again. I've been thinking about issues with wifi disconnecting or any interference but I've noticed that when cozmo loses wifi connection it doesn't tend to shut down immediately. So I followed this guide and opened it up and found a lot of rust between the electrical contacts, as well as in the 5 minute video. I easily cleaned everything up with isopropyl alcohol and now it seems to work fine.
This is great! I really want to buy an army of sick vectors and cozmos on ebay and fix them up and have a little hospice.
Excellent video John! I think that most skilled hobbyists could perform this repair. A few words of caution, however: when you feed the new battery cables, they are typically "live" and have the potential of damaging the circuit or components if they happen to touch any circuit area and make a connection prior to the exact points where they need to be soldered. It may be helpful to snip each new battery lead so that only the insulated wire is fed through, and then stripped just prior to soldering. Additionally, rosin left on the circuit board after soldering can cause problems: usually, 90% isopropyl alcohol and a cue-tip should be used on the soldering joint to remove any excess rosin that pools around the connection. The final job should be clean, shiny, and rosin-free. Finally, the original Li-Po battery is still potentially dangerous because the battery can still hold a residual charge. The leads should not be shorted, they should be snipped off, and the old battery disposed of properly in a recycling facility. A shorted or swelling Li-Po battery can explode and/or cause a surprisingly spectacular fire (see RUclips LiPo battery explosions for examples of what can go wrong).
Thanks Jim! Excellent points here. I am in the process of making a short video dedicated to the soldering process and I will use your comment as the basis of the talking points. Over time I’ve developed a safer way of installing the battery in line with your points- you have encouraged me to get it finished.
Thank you both
Super Helpful! My Cosmo made it successfully out of surgery! I would have never done it without this video. Thanks!
Wonderful tutorial. Me and my son managed to replace/upgrade the battery in 45 Minutes. Thank you very much!!!
I have no soldering tools or the patience for such ‘fine’ assembly procedures so I enlisted the services of John Judge to replace the battery in my son’s failed Cozmo unit.
My son is now very happy as John carried out the replacement battery change with superb results as Cozmo now has more power via charge than he ever did !
For anybody that may be needing a similar fix/repair to Cozmo I thoroughly recommend the services of John Judge.
Very swift service and excellent communication.
Thank you John 👍
+1 upvote
Where is he located? What country? What lead time did you have in sending to receiving?
Bob Hope - He is located on the Isle of Man UK 🇬🇧 ( I am also UK resident )
Duration between sending and receiving back was no longer than a week.... and this was also during the xmas/new year festive season notoriously slow for postal services so I was very impressed.
JohnnyOi thanks Johnny! That’s a fantastic reason to get it fixed around end of may/June and bring it my self on the bike haha
JonnyOi how much did it cost and how did you contact him?
Caz Melton - contact him by email Johnjudge6@gmail.com
Great tutorial! Thank you so much for doing this! I just replaced the battery in my son's Cozmo and your directions helped tremendously. Found the battery on Amazon for $15, perfect fit and twice the capacity. The head is a little tricky but I found if you only remove 3 of the 4 screws, and leave in the lower left screw, it will hold that little plastic rod in place making it easier to go back together. I accidentally left out the counterweight the first time so I got to tear it apart twice! Also the trick with the arms is there is a little tab or clip that you can barely see but if you lift the arms all the way up becomes visible that you want to push in so it releases. I didn't quite see that in the video, they don't just pop off, you have to press in that little white tab, just in case others have the same question. Thanks again! Cozmo is up and running like new.
How much is it in pounds and currency isn’t in “dollars”
Thanks for this, I got my Cozmo battery replaced. Yes it's a lot of steps, the battery is deep down at the bottom of the build pile. Once you get down there it's very easy to replace the battery. The hardest part of the whole mess was getting the head back together. I felt like I could use a 3rd hand. In the end the trick there is to get the screen in, then put the two halves of the head back together almost all the way, maybe even thread on of the screws in 2 turns, then clip the face plate and the speaker back in place.
Great video. I was able to swap out the battery and the little one is very happy. Thank you.
Thank you so much for that video. You did not only safe our cozmos life, you made the twins quite happy, as they now are old enough to get a lot of fun about the interaction with >daddys(!)< toy. The first testrun (man, I was nervous!) after the operation gave a solid 2+ hours playtime. I myself more confidence in fixing things before just bringing them to the next bin.
sdhpCH Thank You! This makes me happy. You should feel proud of yourself for completing this repair. You now have the knowledge and experience to keep Cozmo alive forever.
John, it works perfectly thanks to you, kiss from Paris, France.
Thank you so much for this detailed guide! I am a complete novice at this sort of thing and, thanks to you, I now have a fully working Cozmo again!
Thank you, John. This video is a huge help to me! Our Cozmo was down to about 8-10 minutes of runtime per charge. Replaced the battery and now our Cozmo has new life! I would caution everyone that the larger mah batteries are longer and that the biggest possible battery is not automatically best. We replaced with a 620mah and it rests against the front bottom sensor. Everything seems to work well, but it's a very tight fit. The 540s or 600s would likely be better overall fit but you can squeeze the 620 mah in there.
Thank you so much. Cozmo has resurrected! !
Thank you very much for your detailed video. The original battery was not holding a charge I did the upgrade yesterday and my son can now play with Cozmo again. Cozmo lasted more than 2 hours. My son is very happy :-)
Excellent! I'm always happy to hear success stories. Well done Gavin.
Thanks for offering the link to the part AND offer the fix yourself for a very reasonable price. Great video, thanks!
Great video and a very helpful man! I replaced the battery with no problems with this video but still had no response from Cozmo apart from a flashing green light on its back. I emailed John and within minutes he replied and advised me about wifi signals blocking Cozmo. I will admit I didn't see how this would affect Cozmo from turning on but after turning off my Wifi mesh Cozmo came to life! Thanks again John! I would've bought another one off ebay if it wasn't for you. Much appreciated. Mark.
Thanks to you the little digital friend of my son now has again full power. The old battery only had 5 minutes of playtime left. Thumbs up, great video!
Awesome! Great job - it's a good feeling keeping these little things alive. Plus, you know how to do it again if need be.
This is a fantastic guide. I’ll admit it - I was worried I’d be sending John a bag of parts to fix, but it worked! With John’s guidance, I did it! My son is ecstatic. Thanks, John!!
Hearing this always makes me happy! Well done Thomas.
Hi John. My sons Cozmo shows no response when placed on the charger. Not sure if this is a battery issue. I would like to send Cozmo to you for repair if it is determined that the battery is the culprit. Thank you. How do I get an address to send?
Very helpful video, thank you for sharing this and the info on the replacement battery! My daughter is so thrilled to have her friend back. I did two swap outs back to back, and did find it easier to reassemble the second cozmo by removing the head screws only on his left side. This kept the internal screw rods in place, and reduced the tricky head reassembly from ten angry minutes to one slightly annoying minute. Hope that helps!
Excellent! I always nice to read these stories - thanks for the top-tip on the head assembly (I'll probably make a new video showing what you described; it will no doubt make reassembly much quicker!
@@TheJohnJudge waiting eagerly for the new vedio if it makes the process much easier. World is a better place with people like you John
Thankyou for this tutorial :D I'm not good with my hands at all but this video (+ alot of time) made me fix my cozmo. He's recharging rn, thankyou for this amazing video :)
Excellent. Great work. This makes me happy 😊
The hard part is putting it back together. Especially the spring loaded head! Let’s get a video on that!
Great tutorial, and works like a charm. Thanks!
Thank you very much for your detailed video. I did the upgrade yesterday and now, Cozmo can play more than 2 hours (132 minutes), it's amazing, thank you again :)
Amazing! I'm always happy to hear when my video has helped somebody out! Thanks for letting me know! best wishes.
This video is a life-line! I'm not that good with soldering, but still managed!
Thanks so much for this video. I managed to repair a dodgy Cozmo. Working better than ever now!
john behan excellent! I love hearing stories like this! Well done 👍
Thanks to this video, I've fixed the Cozmo too!
Thanks very clear instructions worked a dream. Fantastic. There may be a few people doing this with Digital Dream taking on Anki.
Thanks! Great to hear this helped. Ideally I’d like to form a list of repairers around the world to help others out. Many people live outside the U.K. and need this service.
Thanks John, I just replaced the battery with the help of your video. I hope that my Cozmo will be powerfull now! In charge for the moment... :)
Thank you so much, Cozmo repaired, my daughters think I'm a hero:)
Mathieu Ferry hehe! You ARE a hero! Well done. I love reading comments like this. Thanks.
Thanks @@TheJohnJudge one comment on tha way I did it. Like another comment I saw today, i was not confident enough on my soldering skill to directly attack the circuit. I just cut the existing wires and solder the new battery on them. Worked like a charm.
@@TheJohnJudge Hi! I’d like you to help. Change battery on cozmo. How do I contact you?
@@faye5296 Hello Faye, email me at johnjudge6@gmail.com
@@TheJohnJudge Great sending you email now!
Merciii beaucoup! Mon fils a retrouvé son jouet préféré!
Thank you SO much for this tutorial! I have ordered the replacement battery and I will provide an update later!
(Later)
Thank you so much for the video. It helped me a lot!
I can only say Thank you. this was a very helpful video.
Thank you so much for this helpful informative video!
Thanks for the tutorial, very simple procedure.
Thank you so much for making this video its helpful.
Thanks for the video, upgraded the battery, everything lights up but that’s about it, can’t reset and the WiFi password isn’t recognised so some nice scrap !
Email me Johnjudge6@gmail.com - happy to take a look over it for you.
My Cozmo dies pretty quick. I was curious on how to fix the battery and this really helped. Unfortunately I’m not certain that I own a soldering iron to complete this repair, so I was curious to see how much it costs to send in my Cozmo and have it fixed.
I just found my anki cozmo during a recent move after not seeing it for a few years, and the battery is dead. I feel confident in following your instructions, I just wanted to check what the dimensions for the battery are? I don't want to order one that is too big. Thanks!
Thanks so much! My youngest wants to play with Cosmos after a hands off from his older sister but it keeps getting disconnected after 5min and we can restart it again and repeat. Not sure if it is battery related but I will get a new battery pack from your link just in case as I tried everything from the anki website. Too bad it is no longer supported.
Love this little guy!
Thanks again for your great video. Subscribed!
I wish I could send over the pond the cosmos for your repair service. Postage is so terrible.
Good luck with your repair. Perhaps try a local tech repair service (the guys who fix phones, etc) and see if they can install it for you.
Why couldn't Anki just have a battery tray with an opening flap ? What a PITA.
Thank you so much for this it really helped and really works!!!! i really recommend it!!
My cozmo doesn't make any sound after I put him back together I'm tempted to see if anything was left unplugg but I made sure it wasn't all I hear if mechanical and the battery is new
I will make a video on this issue. It means his the wire connecting his speaker (which is als his WiFi aerial! To his head has come loose and needs to be soldered back.
@@TheJohnJudge yep exactly I saw it and opened it up and there it was skinny old white cables one was loose.. Thanks for the clarification.
I have a cozmo I very much need repaired.
Are you in UK?
@@TheJohnJudge no in US.
Ok. I could do it but would recommend you join the Official Digital Dream Labs Cozmo Page on Facebook as I know there are US peeps that could help you out also.
I thank you, this worked perfect :D
I tried to unwire the battery but my cozmo got way to much solder on it and it wouldnt come off so i used scissors to cut the battery off and put in my new one i soldered the cables together still red lighting button but loading works im not sure if its entirely broken or i just need to redo that battery wiring somehow
Firstly, allow me to explain the meaning of the 6 digit part number of the battery 503236. The first digit is the thickness of the battery, 50 = 5mm (60 = 6mm and so on. If the first number is, say, 55 then that would be 5.5mm). The second digit is the width, 32 = 32mm wide. The last digit is the length, 36 = 36mm long.
I really can't understand how people think can they get that much more mah from a battery that is damn near the same size? It is simply not possible. It's the amount of chemicals inside the single cell "Package" (Size) that gives it the mah rating. Therefore, you MUST use a larger battery to get more mah, period. Your comparison is the same thickness, but a 2mm narrower and a 4mm longer battery. Actually only making it a total difference of 2mm larger. 2mm does not equate to almost twice the mah rating.The Chinese are notorious for their misleading and lying to people about their products. This is one of those times. Another example of this is, "You cannot fit two gallons of baby shit into a one gallon bucket".
Another thing about it that might surprise you is, Cozmo's original battery lasted maybe 30 minutes, more or less. If you replace it with a 30% larger battery, you will get 9 minutes, more or less, longer. I know, right? 30% sounds like a lot, but it isn't really that much. So, when DDL tells you that the new Cozmo 2.0 will give you up to 30% longer runtime, now you know. The "up to" is because this is just an approximation. Due to the amount of chemicals not being equal in each battery. Also, Due to the location of the battery, it is only possible for a certain size battery to fit. So, this means that a new battery that will give you 30% longer runtime, is the largest battery that will fit in the allocated space. i'm sure they would have made it an even larger battery, giving you even more runtime, but it is more than likely because Cozmo would get a lot hotter, that they didn't even consider it.
So, in conclusion, the chances are that this so-called 600 mah battery is probably twice the price. But not twice the runtime. Now, if you could fit 2 batteries connected in parallel, you would get twice the runtime, common sense and logic dictates this. This also proves that you cannot get twice as many mah from approximately the same size single cell battery. Just trying to help people that really don't understand how Li-Po batteries work.
I just ordered a battery, would love to have you replace it for us!
Email me johnjudge6@gmail.com
I’ve been confirmed by anki (ex)technician that the spring into the head is usueless for any Cozmo of the latest gen, the one with the button on the back. It is tricky to put it back, if your Cozmo has a button just leave it out.
Good to know! Thank you!
I followed the video and replaced the battery, but the Cozmo shows "cozmo wants to be put down" now and the head is keep moving up and down while the lift never moved. Do you know which sensor maybe damaged during I replacing the battery? When assembly the cozmo back, do I need calibrate head and lift position?
The floor sensor on his underside may be damaged. Out your finger over it and hold him upright.
Hi there. My cozmo screen is very dull and cannot find anyway to adjust the brightness or information online as to how to fix this...
Would you be willing to upgrade the battery for me as mentioned in your video?
Many thanks in advance!
John, I ordered a "600mAh lipo 503040" battery and it does not fit in our Cozmo. It is too long. Do you have any suggestions?
I did the replacement a few days ago and woke him up today and he lasted as long as he did before the replacement, whereas earlier today he was going for ages! Any suggestions?? 😰😰
Do you have a wifi mesh system or signal booster attached to your router? strong wifi signals on the 2.4GHz channel can overpower Cozmo's aerial and cause it to shut down (which show the same symptoms as a bad battery)
Thanks so much for this tip but we don’t have a signal booster. 😕 He did last a lot longer when we tried him again earlier, do you have any other reasons why the battery would die so much sooner than is estimated? (He has been on charge for at least 1 hour and also you are one of the best repair youtubers I’ve EVER watched as you make very detailed tutorials and whenever something is wrong with our cozmo, we can always come over to your channel and you have a tutorial on how to fix it! You’re an absolute legend and there is no reason why you should have dislikes on any of your videos as they are a ‘live saver for our little cozmo!’ 😄😄😄😄
Regarding the rubber sticker on the battery, how necessary would it be to transfer over to the new battery from the old one as I have found others say it serves as a thermal insulator between the motherboard contacts under the battery and the battery itself and if so what issues could arise from this?
I think it predominantly prevents any components on the motherboard from piercing the battery sleeve (they’re quite sharp). Also I guess it stops the battery sleeve accidentally shorting any components because it does rest on top of them.
Surely its easier to snip and join the wires rather than resolder if people dont have a soldering iron? Haven't tried mine yet...
Hi, I'm not able to find the 503040 lipo where I live, instead I was able to find a 900 mah 603048 lipo battery. It is about 1 mm thicker and 8 mm longer than the 503040. Will it fit or should i look for a different one? Thank you for you help.
That will
Not fit
Hi,I have a new battery and have stripped the Cozmo down but didnt realise the battery needed to be soldered,can i send it to yiu to replace and re assemble - can you message with a price please?
Hi John I saw a few comments saying that you did this for them. How can I contact you to make you change my Cozmo's battery too?
Email me johnjudge6@gmail.com
Hey there, just found your Video AFTER i replaced the battery by my own xD (used an 620mAh from Amazon).
Question: Cozmo is again up and running, so far its fine.
The Problem: He dont know when the battery is low and just turns off after an hour or so being on his ride.
When he is charging the 3 LEDs jump after a hour or so just from 1 LED to 3 LEDs --> Full.
Is there a way to "learn" on the new Battery or should it work just out of the box? Didnt Factory reset Cozmo - maybe thats the fault?
Best regards from Germany,
Marti
My cozmo won't charge in his charging dock no matter what I do so what should I do? (Mine is a collectors edition)
Hi, I sent you an email earlier today about fixing my Cozmo, and hopefully replacing the old battery which lasts for 5 mins with a better one. I was wondering if you are still able to do that for me.
Thanks!
Hi. I would like to ask you if you know anything about why Cozmo does not speak. The unit was dropped and it just stopped speaking. Please if you have a way to fix it please let me know.
Yes, I can make a video - the speaker in the top of the robots head is connected to the screen/face - a drop could mean that cable has broken off the PCB
Great video, thanks! John, I've mailed you as I'd like to get my son's Cozmo battery sorted.
Is there a link to where you bought this battery? Also how much does it cost for your services if I don’t want to do it myself?
I've just followed this guide and upgraded my cozmo's battery which has worked fine thank you. When resyncing it with the tablet and during the tutorial with cozmo trying to find the cubes his head just flips up and down constantly unable to find the cube. The cubes are flashing blue but it can't find them. any ideas?
Hey John, not sure if you are still repairing these little guys. If you are, my boy has one that needs a his upgrade.
One of the screw on the left front wheel wore off when taking it apart. Any solution?:(
I have another video on my channel showing the solution.
Hi John, do you still perform these repairs? Are you able to ship to/from EU (Finland)?
Hello thank you for the video i was wondering if you can replace the battery on my cozmo please
Hi! Can you please let me know how I can get you to change the battery? Thanks!
John: My son just got a used Cozmo. I was hoping I could send you the unit for battery replacement. The device charges for a few minutes and says the battery is full. A few minutes later the battery is dead. I’m sure the seller was aware of this. Any help would be much appreciated.
Email me Johnjudge6@gmail.com
Thank you!
Hello! I have attempted this repair myself, but struggled somewhat with the soldering. The battery connected to the robot, however I am not able to charge the battery on the the stand. It shows charging but never fully charges and just times out. Played with the robot for an afternoon with the charge the battery arrived with, but not getting any additional charge. Is this from the soldering or possibly not reassembling correctly? Can you give me any advice? Thank you.
Email me johnjudge6@gmail.com
What temperature did you put the soldering iron on to melt the original solder? (In Celsius)
Same question. I put my iron on the usual recommended 350 but have to push really hard on the solder to start melting it. What temperature is recommended ?
Ok I might want you to fix it for me. I've got a couple questions. First, I'd like to know how much the service of you fixing it costs. Also, I disassembled my Cozmo all the way already, so would it be okay if you fixed it from there?
Email me johnjudge6@gmail.com
I can't find the right battery where can I buy it?
Hi John
Where exactly are you based and are you still doing this? I have a Cozmo and the battery doesn't hold charge and I want to revive him.
Can you help?
Hiya. Email me johnjudge6@gmail.com
Hi. You got any idea why the Cozmo right track (motor) not working?
How much to replace battery in cozmo and the cubes both our dead and won't hold a charge?
email me johnjudge6@gmail.com
Could you add a JST connector to remove the need to solder in future replacements
I guess you could, although you would still need to teardown the whole robot each time.
@@TheJohnJudge thanks!
Hi, I bought an Anki Cozmo November 2019 for my grandson. It will now no longer connect to Wi-Fi. I want to email John Judge for any advise he may have but the email address that was listed on a page is not being recognised. Can anyone advise on how to get in touch with John please
Hello Margaret, please email me at johnjudge6@gmail.com
Hello. May you please contact me about your rate to replace a battery in a Cozmo? It was purchased second hand, but did not work after trying to charge it. Thank you, Roman
Is there a certain battery I need to buy for it too work and where can I get it
Hi there. My Cozmo has just died and would love a quote to upgrade his battery. Thank you
Email me johnjudge6@gmail.com
if i were to send it in, would it be okay if i sent it dissasembled most of the way?
Email me johnjudge6@gmail.com
i changed my battery just like in this tutorial and it will claim to charge but when i pulled it off the charger when it said it was done. it would not turn on. i got it to turn on while it was on the charger but nothing would move
Hi there, could you give the link for where you get your batteries from? I'm outside of the UK so i cant buy directly from you on ebay but id like the exact battery you have. thanks
email me johnjudge6@gmail.com