Just a word of caution. Not sure if it was mentioned in the video but just beware of over-discharging your cells, so needless to say, keep an eye on your voltage. Bypassing the BMS will disable your low voltage cutoff protection.
As an American I heard “30” on those balance wires. Took me a good 2 minutes to realize you actually said “13”...😑. Great video man! Super helpful for my build.
My guy I'm just starting a serious college project regarding battery packs and you literally just helped me to solve all my doubts about what to do coming up next with BMS connections. Thanks a lot Lee you're amazing!
Hey Lee, from someone who's very new to the Esk8 scene, I find your videos really educational as I really want to build my own mountain board. Hopefully once I've watch all of these vids I might be able to do so haha. Please continue to keep up these videos your doing a great job for the esk8 community. Well done 👍
Great vid mate! Had an issue with my battery upgrade on my Evolve GT and decided to replace the ESC and BMS with new stuff. Was quite boggled when it came to picking a BMS. Went with a 40a smart BMS(looks similar to yours) but didn't realise I didn't have to use for discharge, only had the stock BMS to go off and didn't have a clue. So the original is actually wired for discharge then I guess.. The charge only seems so much more simple. 🤔 Thanks for all the info. It all makes alot more sense now.
im new to this, have some good electrical knowledge but as i say im fairly new this one. just got my first bms, nickel strips and spacer system for a 36v ebike battery for use on my schwinn stingray chopper. gonna take my time on this build as i want to do it right. currently get about 12 miles from the bike based on a 36v brushless 500w hub. plenty of torque for acceleration up to 18mph. subed to ur channel and realy enjoy the videos. great knowledge
Excellent explanation thanks mate. I have been trying to understand the discharge side of BMS fo high current discharge applications for a long time and found endlessly conflicting info on the net. The info on bypassing BMS discharge control on high current draw applications was the missing piece of my puzzle. Legend!
Pretty handy video with a lot of gold nuggets of info there. Your batteries are a work of art. I will be after some improvements to my battery and BMS in the Icarus when the right VESCs come along.
Fantastic video mate -admirable attention to detail! I normally don't use Patreon but you're a top guy making top content, so I had to. I am not going to attempt wiring a BMS or making a battery pack myself, I just enjoyed understanding the logic/procedure/practices and filling some blanks. But what's most important is that you help educate/bring new DIY builders to the scene, keep up the great work!
Hey man! That's awesome! Thank you for helping me out! In return you are now getting behind the scenes access, hope you will enjoy being part of the patreon crew! I just want to share knowledge and help people understand how to do this crazy esk8 building stuff - knowledge should be shared not hoarded.
Thanks 😁 I just ordered one of your smart BMS. Molicel p42, 12s. For my kaly deck and enclosure. It had trouble finding a Daly. Was watching this video and heard you say you had one 😁 thanks again and have a great day. Esk8 Freedom. Keep up the good work
@@LeeWright awesome thanks 😁 hey you wouldn't happen to know where I could get one of those 12s4p flexible PCB from, would you? I know direlect robot supplies used to have them but all gone and not much coming up in Google search. Maybe some of those 4p PCB would help me out 😉 I ordered the flipsky portable spot welder. Will be my first time welding batteries together. I have done a couple buss bar packs though 😉
Arrived today 😁 thank you very much 😁 super speedy. Only piece I'm waiting on is the flipsky portable spot welder. Maybe tomorrow. Thanks again and keep up the good work
Great work lad perfect battery build but you extended the balance wires off camera this is a trick for new players may not be aware of. Only thing I would have done different would be add a inline fuse to charging port. But not required. 5 star build mate.
Yup! I fuse all my charge ports! I put the fuse on the board end of the loom not the battery. Ta bud, hope this video is useful to people venturing into battery building
Just found your channel, really like your approach to building batteries and putting extra thought into making it as safe as possible. I'm more ebike as never been able to balance on a skateboard but have subscribed to help improve my own battery building. oh and keep the chilled background music
Lee. You the man. I learned a lot about BMS seems I thought I knew. Lol. Almost as funny as you video ending. I'll be getting with you about a 12s battery pack built by you. Blind I am. It would be very dangerous if I were to try and build a big battery, or a battery of any sort for that matter. Hope you'd be intrested in building one for sale. Keep them vids coming. Good stuff.
@@LeeWright thank you bro. Now to get my money right. These times has my money all funny. Let me know a price for 12s5p 21700 cell battery pack. It's going on a drop down board but it's 41.5 inch long at 10 inch wide. Should be enough room to accommodate that big ol battery pack. Oh. Might need a vesc too. Again, thank you Lee. Safe riding mon frère.
I'm curious how much power the bluetooth module constantly draws. Like a BMS always pulls a tiny bit of current, right? That's why you have to recharge unused battery packs after several months, right? So how fast does the bluetooth drain the batteries?
Nicely done sir. I appreciate emphasis on clean safe work area. Lions are nothing to play with carelessly. One thing with these BMS builder/maker/diy videos ? Limited to zero mention of BMS WIRING SEQUENCE. I.E. 'connect negative & then sequentially wire individual cells', or 'wire negative lead, then positive lead and then connect cell bms lines, or it doesn't matter, wire it up with correct polarity & bms lines. Perhaps it's not relevant if no damage can occur from wiring from either pole & all cell lines in between. I have just not seen any mention of 'specific' BMS wiring sequence. Though I highly rate this video as quality information. Thanks for this video! Liked n sub'd
I’m building a 6s 22.2v 30ah lipo battery for my board would I have to buy a 22.2v or could I buy a 25v bms and also it’s a 30ah so would I have to buy a 30ah bms?! Please help!!
Great video mate, really interesting (although my wife had to translate the electronics parts) :) , battery work really good. And loved the bloopers :)
Good vid ,well explained 👍,(ive done exactly what youve done but when connecting b- to the bms the bms blew!very annoying anyway the only thing i can think of was the last bms's harness had the black lead looped into the next port on the harness and then continued as normal,would that have been why the bms blew or any other suggestions would be greatful)keep in mind i double checked and taped down properly before harness or main b- was connected 👍
I don't know if as of today, the problem is solved otherwise you definitely need to work againt your camera focus problem which is kind of annoying. The best way to do that is just to insert images in prod-production.
Fantastic Lee, really nice details. Why do you cut the heat shrink at the end leaving the BMS a bit exposed? Also, how do you calculate how many nickel strips you put on? Also, when you connect two groups laterally, are you bending the nickel strips? Thanks
The BMS I freed as the heat shrink was putting too much pressure on it. It won’t move because of the wiring. Batteries are a whole other topic and I’ll go over that in detail very soon. But yes, bent nickel between the groups across the pack and braid along the length of the pack to keep some flex
@@LeeWright That would be very useful to know! I use to build my batteries like two identical halves and I connect them with a cable. Your approach is new and interesting for me, maybe only disadvantage is red cable must have to travel from the other far side. Wondering about what this "braid" could be, never heard about it...
Does it matter what kind of bms is used when using regen braking? I hawe bms with p - port, I want to replace it with common port smart bms(that is what I was able to find in this size and already ordered it, the question about regen came after fact :P) so the question is, what does control the regen so the battery does not explode, is it motor controller or bms? And does the kind and brand of bms matter when considering the use of regen braking?
Lee, interesting video but next time have the camera pointed more at the table and battery pack instead of your face (just to see more of what's going on). Also, when you extend wires, stagger the splices. It helps with narrowing the width of the harness and possible shorting if the heat shrink happens to split (yes, I can see that they're taped down). Thank you for the video.
Just saved me mucho $$.. needed 40A out but battery bms only 20A out. So bypassing output straight to battery with fuse. $600 battery purchase vs $5 fuse 😋
Hey dude great video! Can I ask you something, I've built a 13s pack for a scooter and the 2 BMS I try on discharge mode for some reason are 11v less than the battery?? So the battery is 53v and the BMS discharge is 42v?? That's same with 2 BMS now. You have any idea why that is?? It's wired 100% right. Hope you reply. Thanks 👍
Weird comments. I don't care if there is music in the video. I also do not care if he rides a skateboard and is not college-educated. I came here to see what he says about BMS systems. I will judge for myself if my time was well spent. It's as if some people just like to start shit about nothing. Good video by the way.
I am building a 4S pack for use in my Tesla, the pack will sit in parallel with the stock battery, but will a BMS be able to let the charge current from the DC-DC converter through or do I have to solve this another way?
what happens when the BMS in discharge mode fails, ie when I turn my scooter on, the battery out voltage drops to 10V yet my cells still register 4V on each group? battery warning flashes as it only sees 10V. I turn it off and the B+ voltage slowly recovers to ~37V on a 36V pack. It has a strange power on process as it looks like the ES pin (37V) shorts to a 12V pin on my display where the power button is. There is no power on wire per say coming out of brushless controller, just a SW pair that is marked 37V and 12V.
Hi please what is the difference between P- and B- in BMS and does lithium battery packs need special chargers or any smart charger can work with them ? Thanks
Some or all BMS boards are listed as 3s, 4s etc. Do i need to get one that matches my series? Can i use a 4s for a 3s setup? If so, which balance wire do i omit? Which brands are good, where to buy reputable brands, what to look for in a bad/good bms. If i want to be able to use the battery and charge it at the same time, is that possible? Do i need a specific bms for that?
I have a 48v ebike that isn't charging through the plug. I'm getting voltage out of the charger but the charger light doesn't turn red. I was able to charge by sending 54v thru the bike socket but not thru the charging plug. All wires are intact. Bad BMS?
My e-Bike does not use a BMS in normal use. I connect 2xBX100 battery monitor/alarms to the balance wires when the battery is on the bike together with a 30A fuse in series with the battery for a 12S unit intended for maximum load of 20a. For charging, I connect the battery and balance wires to 2x iMax B6 chargers for 12S slow charging. In this way I continually monitor individual cell voltages both when charging and discharging. I do not monitor cell temperature which I recognise is a shortcoming of this approach.
Nice flat battery design. Good tutirial. They say trimming the balance leads will send uneven charge to the cells due to resistance difference. Does it really affect?
Can u please help me your video was absolutely amazing and I now understand my BMS a lot better. But can I asks u what is the black wire that is sort of a loop it’s the only way I can put it. It’s comes from the BMS and god back to the BMS but loops on it self. Can u help me in what this duz please
ok, if were bypassing discharge with bms, what is prety wise, because discharge is manageable with controller, what amperage should be used of bms in, lets say 16p7s pack of Samsung 50E 21700 batteries?
If you are only using the BMS to charge then you can charge up to 18A dude, whatever you find the best really! You can easily charge a big pack like that at say 15A or 4A (it will just take longer)
Can you use any bms with the same cell count if it the same type of system? Also if it is the same type of system and cell count can you just use the existing wiring and cut and join the wires using your new bms harness?
I have not built a battery but I starting to get all the equipment and supplies. What I and wondering is if I can get a bms that can do 14s and the in the future I can upgrade it to a higher 16s or hight 8f 8 want to upgrade my motor?
This is such a helpful video! I'm looking to build my first battery pack (10s2p) with 21700 cells. Are there any other considerations which are needed when using these cells in terms of a BMS? Thanks!
The BMS has failed on my Mercedes Smart ebike with a 48V 8.4AH battery. This part is no longer available and am wondering how to keep the bike going. Any ideas!
I've got a summerboard V2 Battery. It's refusing to charge, but I have about 80% left on the battery and it will still run my board (got a free replacement - Aaron mentioned about a problem resistor on the earlier V2 batteries?). I'm getting the red blinker of death on the battery, but I was wondering. Would it be a BMS problem or I have a bad cell? Annoying, the bloody thing is actually well made and I've only managed to get it out of the casing and do some simple voltage checks.. Would sticking a different BMS work? or would it be easier to just rebuild and try and fit it into the current battery enclosure?
Thank you for sharing your ideas with us I’m about to start looking for a 4s BMS but I need at least 300 amps and Bluetooth what would you recommend keep up the good work and stay safe
I have a 48v 26ah pack and it had imbalace section. I got it charging then the green light come on but with I unplug the charger it falls to 38V. I plug the charger back in it shoots to 54 and stays green. I tore the battery pack open and unplugged the bms and jumper the charger straight to the battery bypassing the bms and still same result. does the 18650 have a fuse in it? it floats 54v but no current. thanks!
I have a mercdes smart ebike with a 48V 8.4AH battery.Cells are still good but BMS is shot.BionX which made the battery is defunct. Any suggestions for a Replacement!
VERY INFORMATIVE thank you, i do have a question: can i setup the cutoff voltage of the BMS to anything i want with a smart bms and the app? I want to try and use my battery cells down to 2.8 before they shut off discharge flow. I watch my parameters as i ride my ebikes so I would like to see if i get more range and same life span with a lower shut off voltage.
Just a word of caution. Not sure if it was mentioned in the video but just beware of over-discharging your cells, so needless to say, keep an eye on your voltage. Bypassing the BMS will disable your low voltage cutoff protection.
So your electric skateboard will just ride till it breaks?
Good info
@@juicyboi2923 Yes it will. Once the batteries are discharged beyond a healthy 2.6v per cell, they won't retain the same charging capacity anymore.
As an American I heard “30” on those balance wires. Took me a good 2 minutes to realize you actually said “13”...😑. Great video man! Super helpful for my build.
Man am I thankful I just stumbled upon this video. I wired up my 40a BMS today and wired P- I’ll take that off. Makes total sense now.
No worries bro, glad it helped you!
@@LeeWright I'm rebuilding a ninebot ptr battery pack, its 2 packs 15s2p each pack, factory was 30 amp bms can I replace them with 60 amp bms?
Where can I purchase quality BMS’s?
My guy I'm just starting a serious college project regarding battery packs and you literally just helped me to solve all my doubts about what to do coming up next with BMS connections. Thanks a lot Lee you're amazing!
Now that you learned some more does this video still hold up?
Hey Lee, from someone who's very new to the Esk8 scene, I find your videos really educational as I really want to build my own mountain board. Hopefully once I've watch all of these vids I might be able to do so haha. Please continue to keep up these videos your doing a great job for the esk8 community. Well done 👍
Hey brother! Thank you very much! I'm so glad you are learning some stuff! I'll continue as messages like this get me so hyped!
Man I absolutely love the music in the background! Keep up the awesome videos Lee!
Thanks! Assembled my first battery with this guide, works perfectly!
Well done brother! I'm really happy that this helped!
Your videos always come perfectly in time, so i don't have to annoy you asking how to xD
Hehe! Glad you will find this useful@
Great vid mate! Had an issue with my battery upgrade on my Evolve GT and decided to replace the ESC and BMS with new stuff. Was quite boggled when it came to picking a BMS. Went with a 40a smart BMS(looks similar to yours) but didn't realise I didn't have to use for discharge, only had the stock BMS to go off and didn't have a clue. So the original is actually wired for discharge then I guess.. The charge only seems so much more simple. 🤔 Thanks for all the info. It all makes alot more sense now.
You are most welcome mate!
im new to this, have some good electrical knowledge but as i say im fairly new this one. just got my first bms, nickel strips and spacer system for a 36v ebike battery for use on my schwinn stingray chopper. gonna take my time on this build as i want to do it right. currently get about 12 miles from the bike based on a 36v brushless 500w hub. plenty of torque for acceleration up to 18mph. subed to ur channel and realy enjoy the videos. great knowledge
Sounds like a great build dude!
Excellent explanation thanks mate.
I have been trying to understand the discharge side of BMS fo high current discharge applications for a long time and found endlessly conflicting info on the net. The info on bypassing BMS discharge control on high current draw applications was the missing piece of my puzzle.
Legend!
Pretty handy video with a lot of gold nuggets of info there. Your batteries are a work of art. I will be after some improvements to my battery and BMS in the Icarus when the right VESCs come along.
Thank you simon!
Fantastic video mate -admirable attention to detail! I normally don't use Patreon but you're a top guy making top content, so I had to. I am not going to attempt wiring a BMS or making a battery pack myself, I just enjoyed understanding the logic/procedure/practices and filling some blanks. But what's most important is that you help educate/bring new DIY builders to the scene, keep up the great work!
Hey man! That's awesome! Thank you for helping me out! In return you are now getting behind the scenes access, hope you will enjoy being part of the patreon crew! I just want to share knowledge and help people understand how to do this crazy esk8 building stuff - knowledge should be shared not hoarded.
Thanks 😁 I just ordered one of your smart BMS. Molicel p42, 12s. For my kaly deck and enclosure. It had trouble finding a Daly. Was watching this video and heard you say you had one 😁 thanks again and have a great day. Esk8 Freedom. Keep up the good work
No worries dude! Will be in the mail tomorrow!
@@LeeWright awesome thanks 😁 hey you wouldn't happen to know where I could get one of those 12s4p flexible PCB from, would you? I know direlect robot supplies used to have them but all gone and not much coming up in Google search. Maybe some of those 4p PCB would help me out 😉 I ordered the flipsky portable spot welder. Will be my first time welding batteries together. I have done a couple buss bar packs though 😉
Arrived today 😁 thank you very much 😁 super speedy. Only piece I'm waiting on is the flipsky portable spot welder. Maybe tomorrow. Thanks again and keep up the good work
Great work lad perfect battery build but you extended the balance wires off camera this is a trick for new players may not be aware of. Only thing I would have done different would be add a inline fuse to charging port. But not required. 5 star build mate.
Yup! I fuse all my charge ports! I put the fuse on the board end of the loom not the battery. Ta bud, hope this video is useful to people venturing into battery building
Good advice with the smart BMS and the fish, kepton tape! Keep up the great work. Thx a lot
Just found your channel, really like your approach to building batteries and putting extra thought into making it as safe as possible. I'm more ebike as never been able to balance on a skateboard but have subscribed to help improve my own battery building. oh and keep the chilled background music
Hey John, that's super cool of you to say. I think it's important to make them as safe as possible, bloody bombs haha
Thanks mate, I just got exactly what I need for the charging stuff.
Best BMS video on RUclips, nice 👍
Thank you!
great video, great music
Great video brother. Appreciate the effort and it was super informational. Gonna use it for my build.
Aw thanks dude I couldn't find anywhere how to install this game!! I just cleared Volcanic!
bloopers is my fav part but im going to buy that bms :) (12s)
Awesome! Yeah the bloopers is funny! 😄
What a GREAT Video!! Exactly what I was looking for. Thank you so much!
Lee. You the man. I learned a lot about BMS seems I thought I knew. Lol. Almost as funny as you video ending. I'll be getting with you about a 12s battery pack built by you. Blind I am. It would be very dangerous if I were to try and build a big battery, or a battery of any sort for that matter. Hope you'd be intrested in building one for sale.
Keep them vids coming. Good stuff.
Hey bro you are welcome! Yes we build batteries for sale no probs
@@LeeWright thank you bro. Now to get my money right. These times has my money all funny. Let me know a price for 12s5p 21700 cell battery pack. It's going on a drop down board but it's 41.5 inch long at 10 inch wide. Should be enough room to accommodate that big ol battery pack. Oh. Might need a vesc too. Again, thank you Lee. Safe riding mon frère.
Getting super nerdy! I'm loving the education 👍
Thanks Tim! Super nerdy! 🤓
Nice explanation, i learned things 👌
Thanks man 👨
Great Video! You mentioned that locations of temperature sensors is important, but didnt show them. Where are those places on the battery?
Only that they need to be spread apart and need to be in close contact with the cells
I'm curious how much power the bluetooth module constantly draws.
Like a BMS always pulls a tiny bit of current, right? That's why you have to recharge unused battery packs after several months, right?
So how fast does the bluetooth drain the batteries?
Nicely done sir. I appreciate emphasis on clean safe work area. Lions are nothing to play with carelessly. One thing with these BMS builder/maker/diy videos ? Limited to zero mention of BMS WIRING SEQUENCE. I.E. 'connect negative & then sequentially wire individual cells', or 'wire negative lead, then positive lead and then connect cell bms lines, or it doesn't matter, wire it up with correct polarity & bms lines. Perhaps it's not relevant if no damage can occur from wiring from either pole & all cell lines in between. I have just not seen any mention of 'specific' BMS wiring sequence. Though I highly rate this video as quality information. Thanks for this video! Liked n sub'd
Quick tip. When you put some timecode into the description, you'll get an awesome feature. 😉
The timecodes are in the description bro!
@@LeeWright time codes on videos really put them on the next level , nice 1
Can you connect in parallel the BMS to get more current?
GOD FUCKING DAMNIT
I thought I was gonna watch a BMS (Be-Music Source) video and not a BMS (Battery Management System) video
😄😄😄😄 Sorry dude
@@LeeWright all good! ❤️❤️
Great video learnt heaps
you teach us so much, Thank U Lee
Very thanks for your nice video
No problems!
I love the details. Thanks 🤘
amazing tutorial thanks bro!!
is it possible to connect 4 bms's in series for a high voltage pack ?
I’m building a 6s 22.2v 30ah lipo battery for my board would I have to buy a 22.2v or could I buy a 25v bms and also it’s a 30ah so would I have to buy a 30ah bms?! Please help!!
Hello! Im missing the calculations for what BMS to take, Ampere etc.
Great video mate, really interesting (although my wife had to translate the electronics parts) :) , battery work really good. And loved the bloopers :)
Hahaha! Brilliant. Is the wife an electronics eng then?
Yeah she’s been building printer circuit boards as a job for 20 odd years
Printed
Good vid ,well explained 👍,(ive done exactly what youve done but when connecting b- to the bms the bms blew!very annoying anyway the only thing i can think of was the last bms's harness had the black lead looped into the next port on the harness and then continued as normal,would that have been why the bms blew or any other suggestions would be greatful)keep in mind i double checked and taped down properly before harness or main b- was connected 👍
I don't know if as of today, the problem is solved otherwise you definitely need to work againt your camera focus problem which is kind of annoying. The best way to do that is just to insert images in prod-production.
thanks
Love the video.
I have a few dead cells in my battery pack.
Is it possible to replace the dead ones. Without causing others issues with the hole pack.
Very well done. Awesome editing or the video!
Fantastic Lee, really nice details. Why do you cut the heat shrink at the end leaving the BMS a bit exposed? Also, how do you calculate how many nickel strips you put on? Also, when you connect two groups laterally, are you bending the nickel strips? Thanks
The BMS I freed as the heat shrink was putting too much pressure on it. It won’t move because of the wiring. Batteries are a whole other topic and I’ll go over that in detail very soon. But yes, bent nickel between the groups across the pack and braid along the length of the pack to keep some flex
@@LeeWright That would be very useful to know! I use to build my batteries like two identical halves and I connect them with a cable. Your approach is new and interesting for me, maybe only disadvantage is red cable must have to travel from the other far side. Wondering about what this "braid" could be, never heard about it...
@@LeeWright oh I see. Will you take any measure to prevent water ingress on it?
@@negaopiroca2766 no mate, theres only so much you can do with it. I Leave that to the customer
@@biltre21 i agree with you regarding the positive wire, remedy is to put the BMS at the opposite end and rotate
Can you do a video or quick topic on fuses and why one would use it and why we shouldn't use it?
Does it matter what kind of bms is used when using regen braking? I hawe bms with p - port, I want to replace it with common port smart bms(that is what I was able to find in this size and already ordered it, the question about regen came after fact :P) so the question is, what does control the regen so the battery does not explode, is it motor controller or bms? And does the kind and brand of bms matter when considering the use of regen braking?
Well done, thank you!
Lee, interesting video but next time have the camera pointed more at the table and battery pack instead of your face (just to see more of what's going on). Also, when you extend wires, stagger the splices. It helps with narrowing the width of the harness and possible shorting if the heat shrink happens to split (yes, I can see that they're taped down). Thank you for the video.
Sir can we use 4s bms with 3s battery pack...?
Great video. You you make a video where you start from the beginning on how pack the 4P, spot weld, and daisy chain the cells?
I have something similar on my channel already bro 👍
Thanks!!!!!!
great vid thanks!! 26.52 hope thats not covid19 dude
Great Vid Lee. Feel like im in esk8 school
Can I connect the battery directly to the hover board, bypassing the BMS?
Just saved me mucho $$.. needed 40A out but battery bms only 20A out. So bypassing output straight to battery with fuse. $600 battery purchase vs $5 fuse 😋
Hey dude great video! Can I ask you something, I've built a 13s pack for a scooter and the 2 BMS I try on discharge mode for some reason are 11v less than the battery?? So the battery is 53v and the BMS discharge is 42v?? That's same with 2 BMS now. You have any idea why that is?? It's wired 100% right. Hope you reply. Thanks 👍
Hmmmmmmmm, I don’t know. I’ve heard about this before but never experienced it myself. I have no idea I’m sorry mate
@@LeeWright No worries thanks for getting back to me 👍
Is it safe to discharge straight from the battery? You could over discharge the battery right?
Very good video
Please provide video or info on xiaoxiang bms JBD SP25S 0001
for connection and install on battery and connect to phone
Weird comments. I don't care if there is music in the video. I also do not care if he rides a skateboard and is not college-educated. I came here to see what he says about BMS systems. I will judge for myself if my time was well spent. It's as if some people just like to start shit about nothing. Good video by the way.
Respect brother!
I am building a 4S pack for use in my Tesla, the pack will sit in parallel with the stock battery, but will a BMS be able to let the charge current from the DC-DC converter through or do I have to solve this another way?
what happens when the BMS in discharge mode fails, ie when I turn my scooter on, the battery out voltage drops to 10V yet my cells still register 4V on each group? battery warning flashes as it only sees 10V. I turn it off and the B+ voltage slowly recovers to ~37V on a 36V pack. It has a strange power on process as it looks like the ES pin (37V) shorts to a 12V pin on my display where the power button is. There is no power on wire per say coming out of brushless controller, just a SW pair that is marked 37V and 12V.
Hi
please what is the difference between P- and B- in BMS and does lithium battery packs need special chargers or any smart charger can work with them ? Thanks
If you discharge is bypass is there still a low-voltage protection meaning you can't run the batteries to low
Hi Lee, can you do the bypass with common port BMS?
Thanks
Good question. Yes - just use the P- as your charge port negative and charge port positive to battery positive as usual.
@@LeeWright great!
Perfect
You said that the charging wire is 14 gauge. What about the positive wire going to the skateboard? Would be nice to know.
Some or all BMS boards are listed as 3s, 4s etc. Do i need to get one that matches my series? Can i use a 4s for a 3s setup? If so, which balance wire do i omit?
Which brands are good, where to buy reputable brands, what to look for in a bad/good bms.
If i want to be able to use the battery and charge it at the same time, is that possible? Do i need a specific bms for that?
I have a 48v ebike that isn't charging through the plug. I'm getting voltage out of the charger but the charger light doesn't turn red. I was able to charge by sending 54v thru the bike socket but not thru the charging plug. All wires are intact. Bad BMS?
Super informative vid bro 🙌👌🤙
My e-Bike does not use a BMS in normal use. I connect 2xBX100 battery monitor/alarms to the balance wires when the battery is on the bike together with a 30A fuse in series with the battery for a 12S unit intended for maximum load of 20a. For charging, I connect the battery and balance wires to 2x iMax B6 chargers for 12S slow charging. In this way I continually monitor individual cell voltages both when charging and discharging. I do not monitor cell temperature which I recognise is a shortcoming of this approach.
Nice flat battery design. Good tutirial. They say trimming the balance leads will send uneven charge to the cells due to resistance difference. Does it really affect?
no, it does not, these resistance values are negligible
Can u please help me your video was absolutely amazing and I now understand my BMS a lot better.
But can I asks u what is the black wire that is sort of a loop it’s the only way I can put it. It’s comes from the BMS and god back to the BMS but loops on it self. Can u help me in what this duz please
Great video. Question - will that BMS also balance charge?
What did you use to connect the packs together, making it flexible. It didn't look like a nickel strip
ok, if were bypassing discharge with bms, what is prety wise, because discharge is manageable with controller, what amperage should be used of bms in, lets say 16p7s pack of Samsung 50E 21700 batteries?
If you are only using the BMS to charge then you can charge up to 18A dude, whatever you find the best really! You can easily charge a big pack like that at say 15A or 4A (it will just take longer)
Can you use any bms with the same cell count if it the same type of system? Also if it is the same type of system and cell count can you just use the existing wiring and cut and join the wires using your new bms harness?
I have not built a battery but I starting to get all the equipment and supplies. What I and wondering is if I can get a bms that can do 14s and the in the future I can upgrade it to a higher 16s or hight 8f 8 want to upgrade my motor?
Is it ok to connect the first black cable to B- directly, instead of the negative of the battery? It's a shortcut
This is such a helpful video! I'm looking to build my first battery pack (10s2p) with 21700 cells. Are there any other considerations which are needed when using these cells in terms of a BMS? Thanks!
What if you have two batteries 6p 13s . And you wire them in parallel. Can you use one bms
The BMS has failed on my Mercedes Smart ebike with a 48V 8.4AH battery. This part is no longer available and am wondering how to keep the bike going. Any ideas!
I'm upgrading my solar flood light - powered by X2 18650 batteries should I put a bms in or not??
I'm new to all this .... Absolute beginner
I've got a summerboard V2 Battery. It's refusing to charge, but I have about 80% left on the battery and it will still run my board (got a free replacement - Aaron mentioned about a problem resistor on the earlier V2 batteries?).
I'm getting the red blinker of death on the battery, but I was wondering. Would it be a BMS problem or I have a bad cell? Annoying, the bloody thing is actually well made and I've only managed to get it out of the casing and do some simple voltage checks.. Would sticking a different BMS work? or would it be easier to just rebuild and try and fit it into the current battery enclosure?
Thanks for the video ;)
You are welcome bro!
Thank you for sharing your ideas with us I’m about to start looking for a 4s BMS but I need at least 300 amps and Bluetooth what would you recommend keep up the good work and stay safe
I have a 48v 26ah pack and it had imbalace section. I got it charging then the green light come on but with I unplug the charger it falls to 38V. I plug the charger back in it shoots to 54 and stays green. I tore the battery pack open and unplugged the bms and jumper the charger straight to the battery bypassing the bms and still same result.
does the 18650 have a fuse in it? it floats 54v but no current. thanks!
Do need themistor BMS for 20s?
And how much capacity BMS need for 1500W 72v bldc controller ?
Hi Lee, where do you recommend placing the temperature sensors. Does the phone app allow for alarming a high temperature?
Thanks,
Ed
Great vidro bro.can i use 14s bms to 13s battery pack and how ?
FOCUS !!!
can i just connect the balance wires only and charge and discharge throught b+ and b-
what are the considerations taking into account when we trying to pick the right bms for our battery?
What S count your battery is, whether you are going to run bypass or not and what your charge current will be
I have a mercdes smart ebike with a 48V 8.4AH battery.Cells are still good but BMS is shot.BionX which made the battery is defunct. Any suggestions for a Replacement!
VERY INFORMATIVE thank you, i do have a question: can i setup the cutoff voltage of the BMS to anything i want with a smart bms and the app? I want to try and use my battery cells down to 2.8 before they shut off discharge flow. I watch my parameters as i ride my ebikes so I would like to see if i get more range and same life span with a lower shut off voltage.
Hello,. I'm planning to build my own battery, 36v15ah,.what type of BMS do I use.. Thank you.