Xiaomi M365 Battery Revival - Over Discharge (one year stored empty)
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- Опубликовано: 8 окт 2024
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Here is a guide of how to check and safely revive a Xiaomi M365 battery that was left uncharged and unused for ~ one year.
Did this with a segway air t15e battery wich also showed 15v and wouldn't start charging, was a bit nervous so i did this outside and after charging for about 10-15 minutes the battery was already showing 32 volts. Leaving the step outside for another 2 days i decided to give it a go on the step and voila ! working again. Thank you very much
I hope that you have at least subscribed ;)
I fixed with your instruction. In my case it was 12V and precharging to 15V with power supply then the factory charger starts going red. Thank you.
Thanks for this video. I had my scooter stored for a while without charging and couldn't get it to charge this week. I borrowed a variable dc power supply from my friend and tried this. Now it is charging normally! Thanks.
Great to hear!
Just done this , had to buy a power supply and worked a treat , a lot better than buying a new battery , thank you
Glad it helped
Very nice tuto, it recovers my m365 after a sleep of 13 months without any recharge thank a lot guy !!!
Great to hear!
Hi, Great! Thank you it's working.
If you don't have an external power supply, use the one of Xiaomi directly plugged to the battery connector. It worked for me :)
Thanks for sharing
Sorry, could you explain a bit more how you did this, please?
Nice but it is better to check thé current to avoid it come over 1 A
But how do you do that ?
@@juliensoyer5786 if you have a voltmeter, you can check the current as you charge it.
I tried using the charger connected to the discharge port for 10 minutes and voila! It's working!!! Thank you so much.
You are welcome!
Just want to chime in and confirm this works for my M365. Had been left unused since 2020 (around COVID) so probably 4 years till now. The battery was at ~14.5V and the charger wouldn't charge, so exactly like this video. However mine was NOT blinking any LEDs on the BMS.
Bought a DC power supply off Amazon, make sure it's *at least* 40V or above because this is the fully charged voltage of the pack and also the included charger's output.
Hooked it up using the multimeter probes and aligator clips, make sure you put an insulation between the 2 probes to avoid short circuit (plastic bag should work).
Set the power supply to 40V-41V, then limit the current to 0.5A or 500mA (you'd want to SLOWLY charge the battery back up at this super-discharged state).
I let it charge for about 1 hour, nothing happened, still no blinking LEDs on BMS, nothing. Multimeter showed around 35V-36V with the power supply on, around 20V when off. Tried putting the battery back and plugging in the charger and voilà, charger's LED turned red and the BMS came to life with blinking blue/red LEDs. Funny thing was, I measured 35-36V with the multimeter at this point.
My guess is that the BMS just shut itself off when the battery was too low. But for some reason the charger couldn't "wake" it up until we "jump start" it with the power supply.
Thank you :) Mine needed to go up to 39V while giving 2A current but such as Frankenstein back to life hopefully.
I'm glad you fixed it. Consider subscribing ;)
Thankyou! This helped me bring my scooter back to life. Excellent video.
Glad it helped!
This video saved my mi365 too. I was reading 14v from battery and charger was green. I used the original charger with 42V to charge the battery from discharge ports. After 6-7 hours, charger went into green; voltage from battery was 20v. During that time no led on bms was blinking only charger light was red. Then I tried charging from charge ports, it started charging properly and after 1 hour, battery was giving 41v on multimeter ( I know some weird number) now I am discharging the battery with throttle, front wheel in the air. Hope next time, I can charge it without any issue. Thanks for the video, really great help.
41V is full for the Xiaomi, it prolongs the lifespan as it will not charge to 42V like other scooters. No need to discharge again, it will only wear it out faster. Just use it normally and charge as often as possible, don't discharge too low and also check the battery to be around 50-60% when you are storing the scooter for a longer time interval.
Hello!You have used the original charger and charged the batteries via discharge port for 6-7 hours? Is this ok?I have same issues with my scooter, and I don't have any voltage measuring device.5-10 minutes shouldn't be enough to charge it via discharge port, and after switch to normal charge? Thanks for clarifying this aspect!
No, you just use it for a short time to boost the battery back to life, then you charge it normally.
It worked. Used a commenters advice. And yours for sure.
Great to hear!
@@TechTronic9000 I thought there was nothing I couldn’t fix on those scooters. Are used to work for the Bird company as a mechanic and fixed everything on those scooters there is an a nut bolt screw washer grommet tire rim brakes you name it I’ve done it all. But I never had to deal with a battery that had been drained too far. I’ve had to remove batteries and replace batteries and controllers and dashboards and everything. But I was stumped
Sei un grande! Fatto la prova con alimentatore originale ed é andato alla grande! Top!
Hi, Very good video. I've check all the usual battery issues listed on youtube before finding your Video. I have the same problem as your Xiaomi, the only difference is I left mine was on charge for about 4 months without use. I have variable DC power and have connected the same as you. I'm reading 19v at the BMS terminals, I had to increase to 40v to get a 1A charge (got worried so stopped the forced charge). I did before seeing you Video try charging via the normal charging terminals, but couldn't pass any current. Also when I force via BSM terminals both the red and blue LEDs flash, is this correct? Any advice helpful, Cheers John
You need to charge it for a few minutes through the discharge plug and then the normal charge plug will get active again.
Thank You very much my friend.Ευχαριστω πολυ-.You save me and my scooter,after one year.I fix the battery with the original charger.
Glad I could help! ευχαριστώ που παρακολουθήσατε το βίντεό μου
Hi how did youthat? Can u pls explain the step? Plz
@@audy6947 You can use the original charger if you can wire it to the discharge port, but you need to be careful with polarity and wires not to make a short circuit. Also don't keep it to much connected 5-10 minutes at most should do it.
@@akantou can you explain how you did it, please?
@@aurelm You cut your charger(don't worry you will merge them again),and you connect them how he show on video on 3:17 and charge for 5 10 minutes NOT MORE..
After merge again the cables from your charger and charge your battery.
Very easy method, I will try, thank you sir
Hi, best regards to author realy works for my scooter.
The author, here in person, says he is glad that you have managed to solve it and he hopes that you have at least subscribed as support :)
Awesome!! I just connected the actual charger direct to the battery same as you did have it 5 mins then plugged charger into the normal slot and bingo
how did you do it with the actual charger?
how did you do it with the actual charger? ²
Hi I’m trying to follow the instructions. My battery pack is reading 13.2V when I first started. When I hooked up the variable power supply. It won’t push any amps at 36V. I have to ramp the power supply up to 39V for about 0.5 amps to flow, then in a couple min it drops down to 0.2 amps. I’m afraid to go any higher in voltage. After couple minutes of “charge”, I measured the Voltage of the battery pack again. It did come up 0.5V to 13.7V. Temperature is good, Can I continue do this at 39-40V CV? I don’t want to blow anything up lol.
Ps: in the start of your video, your battery pack measured in at 14.5V. Then why does it take your power supply 35V to push amps? Why won’t it push at 20,25 etc?
The only bad thing that can happen is if it's an old or somehow defective battery, one of the cells could be lower dragging the whole thing down. In that case case it could be a bit dangerous, but it's veeeery rare and if you keep a low current and check the temperature of the pack it should be fine even then.
You are right, but this scooter only had 1 use, no charges and stood like that 1+ years!
Do you have used or second hand electric scooter. I need to buy each one. Becouse i have't inofe money for buy new one.
It's alive again! It's ALIVE!
IT'S AAAALIIIVE! I'm glad it worked out, thanks for watching and I hope I have also got a sub from you ;)
I don't have a power supply. Which one do you recommend for my Xiaomi m365??? It has been months since I don't use it, and now it doesn't want to charge at all. The battery is around 18V :( My scooter is almost brand new. I don't want to buy a new battery. As I used my scotter for only 3 months. I hope you can help me out as I know nothing about these things.. :S
Use the normal charger that came with is. You will have to strip the wires though
Great video. I just got my scooter back after months of no use.
The pack was bouncing between 16 and 19V as if something was drawing current while off.
I plugged in the standard charger and within 1 minute the scooter booted up and was at 33V.
Is this normal? Is it safe?
Can you talk more about the safety feature you talk about the pack "sleeping".
It is safe, fully charge it now and it's ready to be used.
Mine is around 18V , but it doesn´t charge at all. It always has a green light, never turns to red. I don't have a power supply, and I have been using the charger that comes with the Xiaomi which is 48V. When you talk about the standard charger.. what do you mean?
This is the exact issue I am having with my scooter. I even tried charging through the discharge port and the voltage increased to 2.8v. However in your responses to all the comments below you note to only charge it for around ten minutes through the discharge port. If I keep an eye on the voltage and check for heat, can I charge it through the discharge port for longer? Say 30 minutes?
Could also work for 30 minutes but only under supervision.
thank you!!! you saved my pack sir!
Glad it helped!
I have 3.6 volts in mine. Is it dead then? Or can I use a DC power supply like you? Thx in advance.
You can use the DC power source, the BMS is probably under protection and that is why it's only showing 3.6V
Thanks for your reply...How much time do I try to jump start the battery with 32 volts? 1 hour is enough? Nothing for the time being...
Do I have also to use two independent DC power source like you? I have only one...
Working!!!!!! Thank you dear!
You're welcome!
Hi, I have the Xiaomi 1s and have the same problem I think, but intermittent red, green light. (It has powered up but never to a full charger) I bought it from someone who told me they had not used it since June 2024 and they’re lost the charger. Any help would be great.
Thanks. Gonna give it a go. It’s at 2.7
Hi, have you fixed yours? I have the same problem. At 2.8. How do you fix it?
@@hongtm77 I had to reverse charge it. I think it’s called. I’ll find a link on it and send it to you
Basically you unplug the battery and use the original charger. Use alligator clips and clip one to the inside of the charger (it’s positive) and the other u clip to the outside of the charger (negative) then on the other end of the wires put them in the correct positive to positive & negative to negative on the battery (short wires with yellow connector) and plug in the charger but only do it for 7-9 minutes or so. Then check with volt meter Then unplug everything and put it all back to normal and charge it like you normally would.
@ort619 okay thank you so much, will try it this 2 days 🙏🙏🙏
@@hongtm77 let me know how it goes, Be carefull.
I fixed it 🎉 mine was at 27v but I didn’t have a dc power supply so I used another battery which it was a 35v
Hello my friend. Is it safe to use some other lower voltage charger (say 7 volts) to try charge it up just a bit and then put it back to the original charger? I’m asking because I don’t have the fancy DC machine you have but have the same issue with my battery. Thank you
You need at least a lithium ion battery charger made for 36V batteries (that charges to max 42V). You can try using the original Xiaomi Charger.
@@TechTronic9000 i am just going to try charging through the discharger instead :) after 10 minutes it was only at 2.8v. Is it safe to charge this way for up to an hour to get it to 36v?
Mine was at 30.5 V and wouldn't charge. Blue flash when charger disconnected, and red when connected. Charger LED remained green. With the XT30 plug (black plug from the battery to the x365 mainboard) disconnected I pushed the BMS reset button with a toothpick, and boom, it started charging! Just something to try for anyone else, that doesn't have an alternative power supply! :)
Hi Sund. Im in this situation, I dont know where the BMS reset button is :(
@@daveholly9005 it's under the plastic covering in front of the battery pack on the left side... didn't work for me
Michael Wise Cheers mate.. worth a try 👍
@@daveholly9005 I just connected the inside of the charger to the +ve terminal and the outside of the charger to the negative...charged for 10 min and it is now charging through the normal charging port.
Hi, I have a constant blinking red light and the charger stays green. I have charged all 10 cells individualy to 4v and the output where you are measuring from only says 3.4v. Any ideas what is wrong and thanks for the video.
salut ! o intrebare daca ma poti ajuta : am observat , dupa vreo 2 luni de hibernare a trotinetei mele xiaomi m365, ca pe aplicatie la voltajul individual, imi apare cel 1, de culoare rosie, cu o deviere de 0.021V . Este un motiv de ingrijorare sau nu ? Am incarcat-o inca de vreo 2 ori si tot asa. Nu am mai patit asa ceva . Ce as putea face ? Multumesc anticipat si multumesc de informatii !
Nu este nici o problema, o deviatie de 0.2V pune semne de întrebare, 0.02 e foarte OK.
@@TechTronic9000 multumesc inca o data !
@@TechTronic9000 Nu am găsit nici o informație referitor dacă bms face un fel de balansare a celulelor. Din ce observ, încărcătorul încarcă bateria în serial, iar când prima celula ajunge la ~4.2 v se oprește încărcarea. Celulele se pot autobalansa in timpul încărcării seriale? Totuși am lăsat încărcătorul peste noapte și nu am văzut sa facă vreo balansare a celulelor. Tot am diferența de 0.031V între celula mazima și cea minima
Hi, do you happen to know by any chance if the mi 3 battery is the same as 365? Thanks
I don't know if they have the same battery.
My battery pack was reading 1 volt. I have the charger connected through the output and it is charging. I checked after awhile and it was 2.4, then checked later and 3.2.
We'll see how it does. I am skeptical after veing so low.
My Batterie shows me 2.1 volt . can i still fix it wit power supply ? mine doesnt work
Only one cell group or the whole battery? It might be a shut down BMS and might turn back on.
Nice one mate looking good don 🤠🇬🇧👍👍👍👍
Thanks!
Hey great video. I have 3 cells that are 0.1 and bd 0.3 volts. The battery won't charge the connectors looks good no cracks... What can I do... The whole pack is only 3 volts but all the others individually are 3.6 apart from the 3...what can I do... I don't have a charger like you. Tha kyou
If the cells are at 0.1 / 0.3V then I'm afraid that you have to replace them
Hey I had the exact same issue as you. I had the first three cells reading 0.1 Volts and the rest were fine. I replaced the first 3 cells but it's still only reading 3 volts at the connector. Did you end up fixing this? I dont have a charger and the xaomi charger is 42v, 1.7a which is to big am I right?
Na i just boost battery with original charger (42v 1.7a) thru battery cable (before mbs)? Or is it going to explode or sum
You can do that also, but don't do it for a very long time.
He tested positive on negative?? I thought you have to match red red black black
When you use a digital multi meter wire colors don't matter, it will show a - (minus) sign when it's reversed.
Hello how long is it safe to charge with discharge port? my battery is at 17volt I charged it from discharge port with original charger but after 10 minutes it’s still at 17volt
In 10 minutes it should have gone up. Check the wiring maybe something didn't make contact.
hello sir i bought a dc power supply but i don't know how to connect it , could you please help me ?
Salut, Ai idee cat m-ar costa reparatia? :) Cred ca am aceeasi problema.
Nu e mare reparatei, poti încerca si cu încărcătorul original, dar trebuie sa ai grija sa nu faci scurt circuit.
I have a AOVO PRO scooter with a sealed battery pack can i still back charge it ?
The charger used to be green when the scooter was dead but now back charging it has gone red
yeh mate worked with mine
Hello , thank you for the video , i did all the steps , now my scooter is turning on , and the battery is fully charged , but i overcharged it , now the voltage is so high more than 40V , so my accelerator is not working .. and i have some are issue like not able to connect to the App etc ..
i need to discharge the over charged battery, is there a fix ?
Thank you
When the battery is 100% charged it reaches 41-42V. Check your other plugs that go into the controller, maybe a plug is loose.
Does it have to be charged only on the discharge port? What happen if doing on the charging port?
If the cells get to low on voltage as a protection the BMS with disable normal charging to protect from the possibility of a fire. The discharge port lets power go to the cells and increases the voltage enabling the BMS to work again.
@@TechTronic9000 thank you very much! I’ve ordered the parts and tomorrow will give it a try. Cross fingers
@@KeigoMoriyama How did it go?
@@FlameMing I had to replace everything because I had damaged cells
Hello, my battery is showing red light on charger and has 40v but display Shows only one dot, low battery, what to do?
Thank you for the video, wheels on scooter would spin, but whole scooter would turn off when put on floor, bms button pressed, went from blinking blue to solid blue. Can you tell whats wrong with my scooter. Very little mileage. just no usage after 2years
Does the battery charge? What is the voltage?
@@TechTronic9000 I dont know I havent charged down the battery, before that the battery did charge , voltage showing at 41.2V
@@TechTronic9000 any ideas?
Hi, I'm having the same problem with my m365. Now it's 2.8v is it safe to charge with my original xiaomi charger on the discharge port?
Yes you can try it, but monitor it and don't do it for a long time, just for a few minutes and check again the voltage.
It is not good to leave it unloaded, especially for long periods, the batteries are kept only fully charged, or as the energy is easily lost.
For long time storage Li-Ion should be kept at 40-60% SoC and checked regularly not to self discharge lower. The scooter was not mine, i've just fixed it ;)
@@TechTronic9000 Had the mine about 40-60 in storage because of the quarantine for about 3 or 4 months of no use, i charged it 2 weeks ago, would it be possible it lost capacity or power?
Hey mehn,,if i fully charge my scooter then keep it for 2/3 months,,will it happen a problem like this?
Don't store it fully charged it will decrease the lifespan. Store it at 50-60% level. Check from time to time and only charge back to 50-60%.
@@TechTronic9000 and for every day riding is it ok to charge at 100% ??
Yes, charge as often as possible, try to avoid going very low on charge.
@@TechTronic9000 yeah!! Thanks👍
Same problem here. Gauge shows 3.0 V. Is there any chance to fix it this way?
Yes, try to charge it back the same way as I did. You can also use your charger if you don't have access to a fancy lab power supply.
@@TechTronic9000 I measured with different gauge and IT was 16 V. I connected original charger and after 10 min I was able to charge it via normal port. After it reached 100 percent I checked V of each cell in dashboard. From 1 to 5 there is around 4.1 with diffrrence 0.02. from 5 to 10 cell there is 3.6 V on each cell. What should I do now? Is it possible that it will normalize after few charge cycles?
Hallo sir, i have the same problem but i have no that machine to precharge, do u have any idea? Thank u
you cab try with the original charger.
@@TechTronic9000 , i tried already sir, i plug it for 24 hours but nothings happened.
I left my m365 unuse over a year n now not charging. I open the case, and there is no red or blue led. But upon plugin charger, it flashed red 4 times. Check BMS voltage output is 18.40v, but the battery before BMS is 36v. What can be wrong? Is the BMS board faulty after unuse for too long ?
Just leave it on charge for 10-20 minutes and see if it comes back to life
Thanks! I unplugged the balance ribbon, check z fuse ok, check D9 not short cct. B0~B10 are 3.7~v. Then plug in the balances ribbon, at one point it flased blue then started blinking red. But still not taking charge.... Now back to famous blink red 4 times upon power on or reset!
Finally I'd fixed the blink red 4 times - replace the BMS board and now it blinks blue! I hv check n charge up each cells to ~3.8v. Now it can turn on and there are 73% charged.
My battery has 1V from the BMS and 12V from the terminals, can it be revived?
The BMS usually doesn't show any voltage when it goes into protection. 12V on battery terminals is dangerously low. I would investigate first each cell group and check their voltage. Also check the terminals if they are still properly welded.
How do you do this without that machine can I use 12v back up battery’s to connect to the battery to give it charge? I was thinking 2 12v in series connect it and see what it does
You can actually try to use the original charger to do this.
TechTronic9000 how would I do that without breaking the charger to strip back the pos and neg cables
Disconnect the normal charge cable as it has a plug inside, use that connector and carefully hot wire it to the discharge plug. You need to be extra careful not to short the wires as they can blow the charger or the battery BMS.
TechTronic9000 hi mate thanks for replying I done EXACTLY this before reading, I cut the red and black cables that come from the external charger and I was able to use the little white connecter plug to get the 42v, I plugged it in the other red and black that connects to that circuit board and the charger turned red! Then it went green and I’m still on the same place! My battery is giving off 20v or so and it doesn’t go higher than that 😞
@@TechTronic9000 what is the discharge cable?
Hello friend I bought a xiaomi scooter (clone, didn't know :( ) and the battery is reading at 7 volts. Scooter shows no sign of life. I have no powersupply like you do, any way to charge the battery? Green light on charger when I try to charge it. Thanks
Well of it's a clone it might have a non smart BMS, try just to charge it as normal as you do. If it doesn't charge then the battery might be faulty or cells went down under the protection level. It needs more work to find out what is wrong with it.
i got problem not charge and the blue light not blinking what happened? help me
broken battery cell's
hello my question my xiomi does not take gas. I opened the bottom and the battery lights up blue not blinking it is so right. he does not take gas
What voltage does it have?
@@TechTronic9000 battery status (normal)
voltage (41.34)
battery level (7830mAh)
performance (0.38)
Electric (0.01)
100%
how to you trickle charge it if you don't have one of those adjustable voltage chargers?
You can use the normal charger for a short amount of time.
@@TechTronic9000 you mean cute the end of my charger and connect it directly to the output of the battery?
@@xiaobai7060 No, you can disconnect the battery charge cable and jack from the battery, then use that two pin plug and two wires to connect to the battery discharge port.
Where are you located? I need to have my battery tested.
Sorry I don't provide any services.
I have 3 discharged batteries from different source where can i connect the power supply voltage to boost the batteries. There is only input cables connect to BMI and output cable.
Your discharge terminal in the video is that the cable connected to bmi.
Please help
You will use the battery discharge port to jump start it again.
@@TechTronic9000 discharge port is the black one right? With red and black wire but how can I to connect with orginal charger?
Hey awesome video dude! I had 3 batteries at 0.1 Volts I replaced and the rest are good but i'm still having the charging issue. I am still reading 3 Volts from the discharge plug. I don't have a charger like yours but i've got an external 32Volt secondary battery that is charging it but I have no idea how long that could take as I don't know how many amps its naturally charging. I see your recommending to use your original charger but my xaomi charger is 42V/1.7A and your charging with 31V/1A is that ok? Cheers
A 36V battery when it's fully charged will have 42V, that is why the xiaomi charger is rated to 42V. You can use that. In my case I have used that lab power supply for more control and to showcase better what is happening.
@@TechTronic9000 I see. Thanks for the reply but it seems that my scooter charger is stuck on the green light causing it not to charge this way :(
The charger works, green light means that the battery is not taking a charge. It's possible that you might have some cells that become lose and lost their welds, i have another video on that.
Hi I have the same issue, I haven't used the scooter In months and have the red BMS blink of death.. how can I do this without your system?
You can use the original charger if you can wire it to the discharge port, but you need to be careful with polarity and wires not to make a short circuit. Also don't keep it to much connected 5-10 minutes at most should do it.
@@TechTronic9000 so you basically charging backwards?
I used my charger. 2 wires using an 18g butt connector to the center pin of the plug slightly crimped to fit snug. wrap the other wire around the barrel of the charger. crimp 2 male wire ends and plug it into the battery.
@@TechTronic9000 You, my good man are a lifesaver! Just tried it and it turned on after months of being dead! Thank you!
@@miramon4050 are you able to share what it looks like? thanks
I recently purchase m365 model and it gives me 14 % of charge taking to 3.3 km from 100% to 30% .....after 30 to 4 it gives me tha same 3.3 could you please what is the reason.....thankyou in advance
Use an app such as M365 tools and check each cell voltage, if you observe a difference of greater than 0.2V then you have a bad contact, you can check my other M365 videos when I also address the bad contact problem.
@@TechTronic9000 could you please shre video link .....and also I can't connect with m365 tool app suggest me Another app
For the app to connect enable Bluetooth and GPS on your mobile phone first. Here is the other video: ruclips.net/video/iJ2HvCNnYmQ/видео.html
@@TechTronic9000cells voltage differences is 0.05 ..it seems good I think 🤔 😕
Hello, I have exactly same problem but my pack has 8.4V. I dont have power supply like in the video :(
Hi bro I replaced new battery to my scooter but it doesn’t turn on...?
Probably its a faulty bms
where i find a dc power like that
google for "dc power supply"......
basicly that spotwelded batery balancer rail where WORN OUT! remove it.. solder that directly on PCB and enjoy free kilometers..
how can I do this without dc powersupply?
You can try to use the original charger, but it's a bit fiddly to be able to connect wires from the charger. You need to take care not to short out any of the wires.
The blue light is stable no flashing
I fixed mine by flashing BMS again.
Hello.
So i tried this and i managed to get some power into my batteries. Still it wil not charge in the normal way.
Its a pro so the battery and bms is inside the aluminium case so was hoping i dident have to open.
Any ideas why it does not charge on the main port but now show 35v after charging directly on battery port?
My knowledge on the PRO model is limited. If it has 35V it should start and charge normally.