36v E bike Battery NOT Charging - Repair - Li Ion 18650 Dead cells - DIY
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- Опубликовано: 5 окт 2021
- In this video I will try to repair a 36v e bike battery which does not charge , does not have more than 0.2 volts on the main output connector . The first steps are : identifying why it came to the point where it does not charge ( physical damage, water , age etc ) than gathering data about the pack like total voltage , voltage of each cell group , etc Than if it's needed you can force it to charge or rebuild the pack .
Disclaimer :
This youtube channel :"doit_vehicles " can not guarantee that this information suits your car . "doit_vehicles " assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk 
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I love how you explain things in your videos. I'm going to try this on a battery I haven't charged in over a year. Thanks heaps!
Good luck!
Top one, thanks M8.. really useful video.
nice work Mate
Thanks 👍
thanks for the video. Do you actually disconnect the BMS or just apply the leads from the 2ns charger directly to the end connectors(+,-) of the battery pack?
Good one ☝️
Yo thanks a mill. I could not see properly how did you bypass the bms. Can you show us a bit better? Thanks
For charging you should be able to jump start / charge through BMS on a dead battery pack that got drained. It's the discharge that BMS will cut off.
What if only one group of cells measures 0 volts while all the others from 3.8 to 4.0 volts? Mine is a 48 volt battery, there are 13 group of 18650 cells
My battery is showing only 8 volts it is 7 years old the output socket is a two pin system can you get a new 4 pin battery with socket and pins to work the original controller if so how? as the two pin original is unavalable.
Thanks for your input.
Hi, can i put two 36v 12a li ion battery in paralel output and charging port in paralel. Thanks
I have a battery like this which died after 3 cycles. Started to notice at it lost max capacity and then stopped charging. Now it is 2 months ago where it was completely drained. Is it dead?
Is it possible to use a small petrol generator instead of a battery?? Ie 42v from 240v
Can rain damage a battery? I've been riding in. The rain lately and now my battery isn't charging anymore but the manufacturer said it's water proof so I'm confused
I checked the batteries inside and got 39.2 VDC from a 42 V battery, but the connector output to the bike reads 0.5. What would stop the battery output?
Hello,
I have NKY226B02 battery and NKJ039 battery charger. The battery was dead so I send it to the regeneration. After the regeneration I put the battery to the charger and it's charging very slowly. I measured it. There was 27,4V and 0,135A (charger is 29,4V 1,8A) - maybe the charger is faulty also. I put the battery to the laboratory power supply. I put on 29,4V and 1,8A. At the start the battery takes something like 0,175A and after one second it's disconnecting charging. Do I have to put some voltage to the third pin, (between third pin and negative is 10k Ohms - guess NTC sensor) to force the BMS to charge? I'm so confused because I don't know that something goes wrong with regeneration, the charger lost the current efficiency or what? Please if You can give me the advice, since I have no experience with that type of electronics.
🎉🎉🎉🎉🎉 thank you very much for
You're welcome 😊
Hey i have a 48v battery that is reading full charge but not dis charging
Great and helpful video! Thank you! One cell-pack in my 13S7P battery is only getting to 3.6v when the charger turns green, when others are 4.2v. Also it’s discharging much faster than other cells. And after 2-3 days it drops from 3v to 1.5-2v. Is it a BMS issue or a cell issue? Thank you!!
Cell is the issue
I bought a used E bike and the pack was not working, I took it apart and i have about 8-10 cells that are dead or low. I think I will try this before replacing them.
Stet up the positive end of the charger to the first positive battery terminal and then the negative to the negative of the last cell., got it.
My 48v samsung is only charging to 80% its just started to do this. Could it be the charger?
hi there
you never sow annything about BMS. is it good? if it is then why it`s alow to discharged the battery so much?
there was something weird with the bms as well , it kept discharging the battery 🤔
I have a electric scooter that seems to fry batteries. Shut off on me one day during a ride and wouldn't come back on or charge. Pulled the battery and got a reading of 13.3v. It's a 36v battery so definitely shouldn't be that low.
I Installed a new battery that was fully charged around 42v and the scooter still wouldn't turn on. Pulled the battery out checked the voltage and it was at 8.8v?? What possibly happened why did this scooter fry a new pack like that? I took the scooter apart and checked all the wiring and controller. No signs of overheating burning or shorts. No burnt smells and didn't make any popping sounds or buzzing whenever the new battery was installed. No blown fuses either.
Battery seems to just have suddenly went from fully charged to completely dead and I can't find out why.
Is there something I'm missing could there be a short somewhere or something going on that's causing this problem?
Q- I shorted out my charging port with a screw driver. I replaced the charging port but the battery won't take a charge, however it did still run the bike but now the charge on the battery is almost gone. Have any suggestions
Hi . most likely a part of the BMS is burned or if you are lucky just the wires from the charger port to the bms got melted . so just open the case and inspect it
Thank for the video but my problem that my battery works well but it doesn’t charge do I need to follow the video or it’s another problem
It needs a diagnosis
Yes
hello, my 36v battery voltage drops to 13 volts after riding a few minutes and after a few seconds of charging it comes again at 40v. What can be the problem? Can the motor be the problem? it buzzing when riding.
Most likely the cells are dead
I did this and it worked charging the cells directly with 2 wires from the charger. That then mysteriously stopped working any idea why. Think the BMS is fried? Any idea where you get one the mfg is totally unresponsive. thanks love the content
God told me that less than 50% of your battery cells in that pack are losing charge. You can charge them, but will lose charge quickly. God told me that the remaining batteries are near the end of life as well. God told me that you used fast charger (considerably higher than 4A) to charge your battery and caused the battery cells to deteriorate.
Good video. I have a strange issue with one of my 36V Lithium Manganese Dioxide packs. Every group of cells seems to have normal voltage but one group actually has the polarity reversed, dropping the voltage of the entire pack and making it unusable. I am trying to force the correct positive voltage (3.6V) with an adjustable DC power supply to match the rest of the cell groups and hopefully correct the polarity. Ever seen this issue or had a fix for it? I thought about even disconnecting that entire group of cells and flipping the polarity if that's what it takes haha.
My 48v battery will only charge to 74% and when i use my ebike it drains quite quickly, any ideas on best way to solve this?
You fix the problem? I have the same..
@@ConstantinAdrian-op5gv Apparently it's because some of the cells have dropped below a certain voltage, and the BMS cut them off, i think the only way to solve this is to remove the affected cells and charge them individually and put them back in the battery pack. That's the best explanation i have learned so far.
why doesn't anyone check out the charging port first? That's seems the simplest thing to check first.
This is the 12th fix it video I've watched that instantly goes to the cells.
I get the point. If there is something wrong with the charging port it will be easily spotted ( rust or damage )
Dude if you've got less then 3V on all cells, you really shouldn't charge it fast! In that case connect it to a CC-CV power supply with max 100mA/cells in parallel, to charge it over a day or so, until it reaches at least 3V. After that you can connect the charger, and charge it normally! Otherwise you may cause permanent damage to the cells! Even then watch out for cells that get really hot, or cells that self discharge more then 0.1V in 2-3 days after full charge, cause those are damaged and dangerous cells!
Why less then 3v?
@@carstrucks9641 From personal experience a li-po or li-ion cell is more likely to recover from over drain if I charge it slow when it has less then 3V open circuit voltage. The 2.5V-2.8V that is usually specified for Li-ion cells as cut off voltage, it is under load. When you disconnect the load, the voltage usually recovers to around 3V.
No bueno what you did there. Do you sell these batteries? Sooner or later your videos will get you in big trouble if you do.. Take the advise or don't it's up to you. No disclaimers will save you.....