E bike Battery Repair - How to Fix and Troubleshoot it

[@doit_vehicles]

Different Problem Fixed : ( How to revive dead cells ) : kzbin.info/www/bejne/l6OmXol3fKd8hJY

[@Daniel-bn1jf]

@doit_vehicles It would be cool to have a video with you just disassembling different batteries showing where the main functional parts are located and then assembling them again. I have a Moar 24/7 Ebike and I can't figure out how to disassemble the battery without damaging something.

[@robmckee5295]

Gave your video a thumbs up. I've got a couple of ebike batteries that don't have the range that they used to and want to refurbish them.

[@adonis4034]

One of my My wires was dissconected, would have never know if this video didnt exist, thanks!

[@doit_vehicles]

You're welcome!

[@ms.capone3762]

Thank you so much! You made a very informative and enjoyable video.

[@doit_vehicles]

Glad u liked it !

[@martynwatson4929]

Could you provide a link to a bms youd use or recommend? The daly bms seem good value.

[@warlord133]

Hi My battery is not charging but is able to discharge , i assume its a charging port issue , do the charging port have fuse?

[@Jerbrown]

Did you melt the plastic cell holders with your soldering iron? Mine have to be cut at both ends. Curious what easiest way to do it it. Thanks!

[@carpoholic8149]

Do you do this as a service cos need mine done?

[@Daniel-bn1jf]

@doit_vehicles It would be cool to have a video with you just disassembling different batteries showing where the main functional parts are located and then assembling them again. I have a Moar 24/7 Ebike and I can't figure out how to disassemble the battery without damaging something.

[@whazzat8015]

Thanks good intro to trouble shooting. I need a good troubleshooting checklist. I am slowly putting one together , but giants stand on the shoulders of others. Do you have any pointers towards one?

[@adassociates8235]

Our ebike battery measured across pin outputs show only .996v instead of 52v, we just ran about 5miles and back home, next day nothing on display. We charged until green light on charger lit up. But measures across terminal still show 0.996V, what is the issue? Thanks

[@rduwe9466]

can you repair any battery or are there batterys who are not fixable

[@myscreen2urs]

One of my packs is partially shutting down. My throttle display shows that it's still active but when I trust the throttle, it pulses and then stops. I can maybe get movement of I feather it down a hill but as soon as I have to come to a stop, I can't take off again. I checked all my connections and have confirmed that it's not a problem with my controller or motor. Would this likely be a BMS issue?

[@أحباءأنسجابر]

Hello, I have the same problem, how can you help me? Thank you

[@healthyamerican]

hello..my ebike will cut off if i give it more than just a little throttle. battery is fine. bike runs fine if i barely give it throttle..if i give more than just a little throttle, or if im on an incline it will cut off. i have to turn key off then turn bike back on and i go through that over and over. obviously i cant go very fast. battery is testing fine before and after riding. any suggestions?

[@echeverriaemilio]

Where do you get the parts? Spare batteries, nickel links, etc? If you don't provide that info how do you expect anyone from fixing anything? Good video though!

[@SteveGadd-x9n]

I have a 48v folding ebike 1 year old. It started shutting off randomly recently. It is at or near full volts when it does this. I can open the folding part up and close it and everything is back to normal. Ride a little way and it shuts off again. I opened the battery case up and everything looks like new. check voltage and holds at 53.1 volts. Scratching my head. I guess maybe the bms?

[@peppapig2112]

My 52V battery (14s4p), despite the fact that I have set 41V as the cut off Voltage, actually shuts all off (display included) when it reaches 48V ish. I have opened it up to inspect and I found neither corrosion nor evident physical damage. The only thing is one group of parallel reads 2,6V while all the other group read 3,3. It's because one group has gone below the BMS cut off voltage that it shut down, I believe. All this has happened after charging (twice) the battery @100% in order to let the bms balance the group of parallels. Do you think that if I replace that parallel group I will fix the issue?could it be one o two cells of that low voltage group badly welded leaving the other cells bearing most of the job and so depleting faster ?

[@elfuertejuice]

Do you have website where I can send you my battery and your fix it?

[@fluorescentblack4336]

Good video? Saves a lot of money and waste doing things like this yourself. Subscribed!

[@doit_vehicles]

awesome)

[@johnherrewyn4883]

Do you offer a repair service?

[@Coldhawaii100]

so its best to change the whole group, to insure that they are in balance?

[@doit_vehicles]

It's better to do so , but it also depends on how much you want to invest in it

[@hellfire9145]

Thanks for the informative video, But you show that repairinga bike battery is quite tricky job and really reqires special equipment

[@abelramos8652]

Hi my friend. My ebike battery drains pretty fast. Whats the most common cause of that?

[@doit_vehicles]

it might have been used over it's lifetime

[@abelramos8652]

doit_vehicles not the problem only 2000 kms my friends has almost 6000 on his battery still last a lot more!

[@doit_vehicles]

@@abelramos8652 Than who made the battery has to have a look inside , maybe water got in , or a cel disconnected or is just the whole battery capacity not according to the specs .

[@yibbletricky956]

ok, heres one: everything if fine, even on test peddling. however, when i peddle off my elife ebike cut out......whats wrong?

[@antoninpres6644]

Hi i am trying to repair a battery, why shouldn't i replace dead batteries with higher Ah one with the same max current?

[@doit_vehicles]

You can but you'll need to replace them all

[@l.b.99]

Thanks for the video man! But I don't understand how can you know which batteries are in the same parallel group together! :(

[@doit_vehicles]

Hi ! I am glad you liked it . By knowing how the battery is build you can recognize the nickel strips connections and spot the parallel groups ; You can check out the video where I build the battery so it might be more clear .

[@mrkeopele]

thank you, just what i needed to see, not that overwhelming to figure out?

[@simetric6551]

My ebike battery has a rare problem. It is a 48v 20ah. It works perfectly for a few hours and when the display still reads 75% charged it suddenly dies and turns off everything including the display. When I get home and test the battery with my multimeter it read 36volt. I charged the battery for a few minutes and reads 51v again. Use it for a few meters and turns off again and the multimeter reads 36v. What do you think is the problem?

[@doit_vehicles]

It happened exactly the same thing on this battery . There are two possible situation either some cells are disconnected or the capacity of one group of cells or all battery is low and the power will drop faster after full charge . Also the fast charging you describe sounds like there is a capacity or connction betwen the cells issue .

[@alloycrow917]

Thanks. I encountered the same problem today on my ebike. After further inspection one of the cells was pinched.

[@danielgilbert8053]

Great video and explanation! My battery just died on my ebike, I suspect it is the BMS and some faulty cells. I opened it up and there is corrosion on the metal strips connecting the terminals and on all the wire soldering points so i suspect the whole unit was messing up the BMS. I am going to test each cell with a volt meter and then decide whether to toss it or try to fix individual cells. Unfortunately I bought a cheaper battery and there is no plastic frame work holding the cells together just paper and lots of hot glue. Do you have a recommendation for a supplier of good quality batteries for my unit.

[@doit_vehicles]

I understand ... First find out what model of batteris do you have . Like in that video its a " dolphin case " type . I personally make my own batteries and I dont buy e-bike batteries from sellers since as you mentioned they are not good quality in meny situatiions ; so unfortunately I can't recommend anyone . So depending of how much you wanna invest in your e-bike , the best option is to build a spare battery by yourself in the same case as the "stock one " is ! Might be an investment at the beggining but in a long run you'll save money doing so . Whatever you chose look on aliexpress for things you need ; fron my experience I got good quality "as described " stuff from that website.

[@bruceevennett955]

Where did you get the spot welder? What are its specifications?

[@doit_vehicles]

This spot welder was not good , O got it cheap from aliexpress

[@knurled1]

Thanks, my year old light use battery is playing up, I'll use your tips to investigate. 👍

[@doit_vehicles]

That's cool :)

[@davidtheriault329]

I need help? My 48v 13ah switch is faulty and the battery will not power the bike.I need to bypass. Don't know how

[@doit_vehicles]

Just check which wires connects to the bms from the switch

[@super73uk]

Very interesting video - You explained very well!

[@doit_vehicles]

✌

[@peppapig2112]

Hi, thank a lot for your informative stuff. My 52V battery got wet in heavy rain and my ebike display died. Battery won't charge anymore. Charging terminals voltage read 45V (same as the display shown voltage at the time of the rainy event), while discharging terminals read 24 V. Does that mean that only the BMS is at fault?

[@doit_vehicles]

Hi ! Check the discharge terminals without the bms , that will tell if only the bms got damged . If you find 45 v just replace the bms and you should be good to go . Also check the voltage of each parallel group , it should be around 3.5 volts each , or at least equal betwen each other .

[@peppapig2112]

@@doit_vehicles forgot to tell you that I did (almost a year ago) as you suggested and found that only the bms was faulty. Ordered and installed a new bms and today that pack is good. Thanks a lot

[@newaznabil8573]

Hello...I didn’t start my bike around 6months and today I found my battery don’t take charge any more....before there was no problem at all..just I didn’t start the bike more than 6months...what I can do at this situation?do you think it can be repaired?

[@theyoutubeguy1545]

Leave it on your charger for a day or so to reset your BMS. Because it’s been sitting so long your voltage most likely dropped too low so your BMS shut itself off, so no “juice” to the batteries. Or depending on your charger type it might be unable to read such a low voltage, Therefore it won’t start the charging process. I’m not an expert but it’s what I’ve heard when researching my own better pack issues

[@Reinholdublin]

Hey man! My baterry apparently got wet and it is no longer charging or working at all. Even the battery's display is not even working. I cycled in the rain a day and left it outside, the battery was fairly full then in the morning it was died. Any tips?

[@doit_vehicles]

Hey ! It sounds like a short circuit . Try to open the case of the battery and check with a voltmeter how many groups of cells have power . Then try to charge those separately

[@Reinholdublin]

do it ! I figure it out, some wire wasnt working properly. Thanks for your reply though

[@shonevans2563]

doit_vehicles I have similar issue Battery charger port got a little wet and started sparking . It still chargers fine but when you unplug charger it sparks still. Was wondering is there a grease I can use on the charger port to bring that piece back to life ? It's a little corroded because like I said couple of drops of water fell in there . I'm not sure though if I apply the grease like dielectric or something as simple as Vaseline if Its dangerous .

[@shonevans2563]

I've seen videos of people using grease on car batteries for corrosion issues . But not sure if that would work in my case . Don't know how to swap out the charger port piece just figured I could do a quick fix like swab the area with grease so the corrosion won't get worse and stop the sparking issue.

[@mhmdsaleh3502]

Good good v.good job

[@Michael-eo5nf]

thanks for this video everything was plain and simple to understand

[@doit_vehicles]

You're welcome

[@renosmaster]

Very helpful , thanks for sharing

[@doit_vehicles]

you're welcome :)

[@cjhage]

Hello how can i check the BMS Of the accupack

[@doit_vehicles]

Hello ! You meen to check if it does work properlly ? Just check if it does charge the battery ; even with some bad parallel groups the BMS will try to charge the battery for few seconds and than it will stop ; if it does so , than the BMS it's ok .

[@robert71457]

Good info! Thx.

[@doit_vehicles]

Welcome!

[@danieltapia6200]

Hello, what happen for example if my battery has 3300 mah cells and I replace 4 faulty cell with 3400 mah but same voltage? Would it have any problem?Thanks

[@doit_vehicles]

Good question . Since the difference is not that significant it won't hurt anything in a short term . But over time if let's say thoose 4 cells are 4000 mah than they will always tend to have a higher voltage than the rest of the cells while discharging ; so that will confuse the bms while charging / discharging causing it to heat up / burn or shut down the charging option . Also thoese cells will always tend to charge up the lower capacity ones and that will show on your battery level indicator a lot of up and downs while cycling .

[@danieltapia6200]

@@doit_vehicles got it, thank you for taking the time to reply.

[@valentinelefrere276]

I tried to wire my e bike from an chinese manufactured controller. They don't tell you which wires to connect the battery to. I think I shorted it. I don't know where the fuse is either. the battery is dead now and I am not sure whether there is a fuse to replace it or whether to get a new battery. Also the control box wires without a guide to connect them are a problem. Any ideas?

[@doit_vehicles]

Hi . The battery should be fine as long as it was not directly shorted ; the only thing that shoud be fried is that controler . On some batteries the fuse is inside and not changeable from the exterior ; so you will need to open ot up and see . Is a good idea to check for wiring diagrams from the seller before buying a controler / or get the controler from where you got the bike ... It's hard to tell you more precisely what to do without seeing the stuff in front of me .

[@SKBKER]

I've seen too many videos of batteries exploding to put me off wanting to do this . I have 4 batteries ranging from 36v to 48V . So far so good but if one stops I will just buy a new one .

[@doit_vehicles]

haha , why should they explode ?

[@SKBKER]

Possibly faulty cells or the idiot in the videos I saw did them wrong but they smoked and then BOOM .

[@doit_vehicles]

hahaha , on youtube there is a place for everyone :)

[@serchmarc]

do you have a video where i can test the hub motor without a battery?

[@doit_vehicles]

Just check where the plus and minus goes from the battery to the mounting place and than apply 35 - 42 v to those pins .

[@serchmarc]

@@doit_vehicles without a battery!!! just with AC from home.. is there anyway?

[@doit_vehicles]

@@serchmarc as long as it is within voltage limits, yes . But it will be hard to find AC 35 - 42 volts so you will realistically need a battery for that ..

[@ppwlee]

Hi, I got this ebike battery, 4 years old, not used much (less than 100 charge cycles), but recently failed to hold charge after letting it sit for the winter. 1. After plugging the battery to the charger, the charging light turned from red to green (indicating full charge) within a few minutes. This wasn't the case before when the battery was charging/running fine. I measured the output of the charger with a meter and it's 41V. 2. Upon charging (eg 8hrs) the bike would run and the LCD controller displaying full bars for a couple minutes and then shut off all of a sudden, restarting the controller would only get the bike to run for a few seconds and eventually it won't start again. Battery seems completely drained. Any idea on what could be wrong and steps to troubleshoot? Thanks.

[@doit_vehicles]

It sounds like the cells are "dead" and they can not hold the charge . However after a winter of storage they should drain to completely 0 . What is the total voltage of the battery? Should be betwen 30 and 42 volts . If its much less than 30 v than the battery is damaged . You might also try to charge the parallel groups individually with 4.2 volts and see if it holds tge charge . Depending of what's the quality of the cells , it might be possible to revive them if charged individually / parallel groups Also the bms is not usually made to charge a 36 v nominal voltage battery from lets say 10 volts up to 42 v - fully charged . That' why the only thing you can do is to charge the parallel groups or bypass the bms and directly apply 42 volts from the charger to the battery .

[@doit_vehicles]

And if you manage to "revive" the battery it will have less range than before ..

[@ppwlee]

I opened up the cell pack and found one leading pack of 5 batteries giving only 3.2V. the rest are 4.1V. total battery output is 40.1V without load. How do I charge the individual suspected pack and what charger or voltage/amp do I need? I only have the charger that came with the battery pack.

[@ppwlee]

Do you have any recommendation on where might I find the individual replacement cell battery to buy? My battery is ur18650zy. I assume equivalent band is ok?

[@EndUser-yu7gg]

Sounds like your battery pack went into protection mode ... I keep my battery plugged in and cycle it anytime the bike is sitting for a bit ... It's a commuter for me so only a few days tops does it sit idle ... Fthpower in CA might be able to help you as they service ebike batteries... They'll be my guys when my batteries start going

[@madhumitasarkar5432]

Where is BMS available?

[@doit_vehicles]

I used aliexpress at that time

[@Unibomber2u]

I have a 52V 14S ebike battery that will not charge. Meter says current voltage is 52.6V and max is 58.7V 3.9V per cell current. I by--passed the BMS and using 3 different chargers all with max voltage of 58.7V and still battery will not charge. These are new batteries and battery charged 1st time after building battery and has not taken a charge since. Any ideas? Thanks

[@doit_vehicles]

That's strange . It's hard to guess without having the battery in front of me , but I would do the followings : 1) Visually inspect all the solderings and spot weldings 2) Measure the voltage of paralel groups of cells and compare them .. 3) If you have a charger that do the discharge test , do the charge / discharge test of each parallel group and see if they are ok 4) Try to charge the battery without BMS directly on the battery terminals 5) Make sure that there are no short circuits or wrong connection .. 6 ) Make sure that the charger is giving 58 v to the battery .. 7) In the worst case , you must disassambley the whole battery and double check all the cells individually to test them if they charge / discharge I should probabily make a video about these things ..

[@bayonictx8305]

If battery voltage is good then is for sure the bms? Ob the bycicle Nothing changed, engine or wires. and it stopped working. Even while chargeing the ebike not working...

[@doit_vehicles]

check the total voltage of the battery from the bms and without the bms ; if without the bms the battery has betwen 33v and 42 v and with the bms 0 , than the bms is broken as long as all the wires are properly connected .

[@josecolon6584]

Can you install a bms for me

[@josecolon6584]

My baterry was short circuit.

[@georgeshaw6207]

Great video !!

[@facelessvaper]

ooh this is good stuff man - I haven't had a look into your other videos but you seem to be over looking the step that i need to see, hopefully i do not need to replace cells as my electrical knowledge is no where near your skill level, I will cause fire so I don't think I would go down that route - however that said my battery, a dolphin case, like yours has something rattling inside and I need to take it apart - please could you do a vid showing the case removal process!

[@doit_vehicles]

Thanks for complimets :) The most "difficult" part while disassembling that dolphin case is the handle spring ; you must keep it under pressure while pressing the 2 parts of the case together . kzbin.info/www/bejne/qHvCmX2vhtV4hdk This is a video where I build one battery in the dolphin case , you can skip to the end where I assembley the case - it might be helpfull !

[@doit_vehicles]

I will consider a separate video only about removing the case :)

[@facelessvaper]

Thanks for the quick response, In all honesty I bit the bullet and opened it, i tried videoing it, I'll see how that turned out - anyway yes I did use that video as a guide, most helpful, i was going to just leave the handle minus the spring and let it flap about (lol) but I did figure it and managed to get it in spring included - It turns out that there was an odd small metal nut like the outer ones, that had come loose, from where I did not want to poke around too much but everything looked intact, I did a 20 mile ride today with a metal bit loose inside my battery - SCARY! - thanks again - Subscribed

[@doit_vehicles]

You're welcome ! I am glad that you manage to find it . thanks :)

[@narspo_md]

When I plugged my battery to the charger it created a spark and burned the area around the connection. Now can not plug the round part of the charger to the slot. How can I replaced that part?

[@doit_vehicles]

If that burned part is on the battery case , you might have to look for a new case . it's hard to say something without seeing it

[@narspo_md]

Thank you for the fast reply. I dont how to explain it but I just place a review at Amazon for my bike with picture of the socket. - ANCHEER 2018 Waterproof Folding Electric Bike with Removable 36V 8Ah LG Battery, Foldable Electric Bicycle with 20" Aluminum Alloy Integrated Wheel, Full Suspension and Shimano Gear. Its the socket that burned and I went to several website and nobody is selling the case including the company's website. My friend tried to push the charger then it spark again. Scared it might just explode. I bought the bike last July and I just rode probably 30 miles. bummer.

[@doit_vehicles]

All right ; so if that socket / connector on the battery itself is fried up and you can't find a replacement, I personally would open the battery case and remove the old charging connector as well as the one from the charger (both male and female basically) and replace it with some other regular ones you'll find and physically fit . Also after removing the old conectors try the battery if it does charge with the conectors removed .. find out what is causing the shortcircuit ? Maybe it was a piece of metal inside the conector or some wires got disconnected inside the battery and touches other wires ... Now , of course it wont look good with a new charging conector on , but at least you will be able to charge your battery ! you're welcome anytime !

[@narspo_md]

Thank you very much. Great info. I will find somebody who can do fix this in Houston, TX.

[@CholoKiD92]

my battery charges but when plugged to my ebike it doesnt seem to run any power through what could be wrong?

[@doit_vehicles]

Does the bike turn on ? If not open up the battery and check the wirings ; if they are ok the bms might be the issue

[@CholoKiD92]

@@doit_vehicles thanks for the reply i will try that cheers!

[@cjimenez1203]

@@doit_vehicles I have the same problem.... I have a Samsung SDI 36volts, 10Ah battery. I'm not sure if it is just the same but, my battery has a board with P+, P-, B+, B- , and looks like it is different to BMS.

[@nikstoun]

Mix old cell with new cells is not fix the problem for long time, when discharged old battery discharge fast ,than new cell.

[@staxter6]

NIce one. Buddy's wheelchair battery died £1400 for a replacement! Would like to have your skill set to refurbish it for him..

[@doit_vehicles]

Hei . Where do you live ?

[@bowdui6815]

my ebike battery discharge very fast,, what's the problem of this.. thanks

[@doit_vehicles]

Is tha battery old , or you did more tha 500 cycles of charging / discharging?

[@bowdui6815]

my battery is new and I charge up to 5 hours until the fully charged indicator turned into green

[@doit_vehicles]

It sounds like the cells are not holding that charge ;is it homemade or from shops ?

[@bowdui6815]

@@doit_vehicles from shop

[@bowdui6815]

is it not charger did not really charge but the green indicator already ok

[@HatarMyspace]

You should not hit defense less cells like that! They might get you back one day.

[@madhumitasarkar5432]

New cell mah?

[@doit_vehicles]

2200 mah

[@josephcanning4557]

I need parts schematics board for prototek battery Samsung Phantom X2 parts

[@madhumitasarkar5432]

Mileage of your e bike?

[@doit_vehicles]

Around 5000 miles was at that time

[@laifali120]

Hey ,buddy , can you show us how you balance the cells ?

[@doit_vehicles]

Hei ! Yes , pretty soon !

[@magnacarta7136]

Personally I wish there were professionals I could pay to test and fix my battery. I just don't have the confidence with electronics as someone who had training. I know enough to assume I'm having a BMS issue but no resources for people who will repair.

[@doit_vehicles]

Just go for it

[@magnacarta7136]

@@doit_vehicles don't have the equipment, also don't know enough to order the right BMS

[@RobvanGils]

why can you not bigger amp batterys in more range?

[@doit_vehicles]

The controler can not handle more than 15 ah on that bike

[@RobvanGils]

​@@doit_vehicles i like to to put newer batterys in my ebike but higger amp can blowup the controller...

[@MrJAZMARTHOMAS]

Looks difficult

[@perledelsten6373]

👌👌👍👍

[@olegpetelevitch4443]

Oh my god after all that and you have to buy all the equipment ? Costs less in time and $ to buy another ! Sorry !

[@doit_vehicles]

for just one battery yes is not worth it ! few years ago e bikes were not that popular yet / more expensive .

[@ziparis]

Or just take it to a shop - they'll have the equipment.

[@adassociates8235]

Our ebike battery measured across pin outputs show only .996v instead of 52v, we just ran about 5miles and back home, next day nothing on display. We charged until green light on charger lit up. But measures across terminal still show 0.996V, what is the issue? Thanks

[@md.alauddin7052]

Great video, thank you so much.