10 months ago I bought a battery pack from bmsbattery and now it's dead...:-( its a 10amp 36 volt bottle battery and now it only reads 2,3volt after charging. Bmsbattery has no guarantee and would only offer me 5% discount on a new 200$ battery pack, so I'm reluctant on spending any more money there... So is there any way of fixing the batterY? here's a link to the battery https://bmsbattery.com/ebike-battery/567-36v10ah-bottle-ebike-battery-power-bank-battery.html
Need help fixing battery ;-)
- Thread starter toillball
- Start date
dogman dan
1 PW
Yes, the battery can be fixed, but no, it's not going to be easy.
The whole battery is 2 or 3 volts? That usually means the bms has shut off. First thing to do is see if you charger works at all. Broken plug, or whatever.
Then if the charger does work, look into why the bms won't let it charge. This means a voltmeter, and looking at the voltage of each cell. If no groups of cells are below 2v or so, there is hope. If any are 0v, they are dead.
Lastly, what size controller do you have? A 10 ah pack can easily be killed by a larger controller, typical in the "1000w kit".
The whole battery is 2 or 3 volts? That usually means the bms has shut off. First thing to do is see if you charger works at all. Broken plug, or whatever.
Then if the charger does work, look into why the bms won't let it charge. This means a voltmeter, and looking at the voltage of each cell. If no groups of cells are below 2v or so, there is hope. If any are 0v, they are dead.
Lastly, what size controller do you have? A 10 ah pack can easily be killed by a larger controller, typical in the "1000w kit".
Thanks for the reply! I have a 350w controller. And the combined output on the main battery poles is 2.3volts. I've opened it up and it seemes the cells are wired in clusters , some reading 4,8,12 and up to 16v going into the bms. ( if this makes sense)
I'm guessing if the charger was broke then the battery still wouldn't drop to 2 volts if the bms worked?
So I'll have to check all the cells first?
I'm guessing if the charger was broke then the battery still wouldn't drop to 2 volts if the bms worked?
So I'll have to check all the cells first?
dnmun
1 PW
it sounds like the BMS did work and the BMS is shut off for LVC.
take a picture of the battery you have and post it up. do you have a voltmeter? post up a picture of the BMS and measure the cell voltages on the BMS where the sense wires are connected. put the probes into the solder where the plug is soldered to the pcb. measure adjacent cells using the 20V DC scale. post up the numbers here.
take a picture of the battery you have and post it up. do you have a voltmeter? post up a picture of the BMS and measure the cell voltages on the BMS where the sense wires are connected. put the probes into the solder where the plug is soldered to the pcb. measure adjacent cells using the 20V DC scale. post up the numbers here.
Hello again 
I'm on my third broken 36v10ah bmsbattery bottle battery now :? , they seem to work for about a year...
I've done some research on li ion since my last post (and ordered one with Panasonic cells now
) but was wondering if the old one could be salvaged.
The balance leads read:
B1 = 4.7v
B2= 9.3v
B3= 14.2v
B4= 18.5v
B5= 23.1V
B6=27.7v
B7=29v
B8=33.6v
B9=38.2v
B10= 43v
So it looks like BMS shut off the battery due to the big unbalance.
Is it possible to try and balancecharge the paralell packs and reconnect the bms?
And since there all connected now, why doesnt it balance itself?
I'm on my third broken 36v10ah bmsbattery bottle battery now :? , they seem to work for about a year...
I've done some research on li ion since my last post (and ordered one with Panasonic cells now
) but was wondering if the old one could be salvaged.The balance leads read:
B1 = 4.7v
B2= 9.3v
B3= 14.2v
B4= 18.5v
B5= 23.1V
B6=27.7v
B7=29v
B8=33.6v
B9=38.2v
B10= 43v
So it looks like BMS shut off the battery due to the big unbalance.
Is it possible to try and balancecharge the paralell packs and reconnect the bms?
And since there all connected now, why doesnt it balance itself?
Sunder
10 MW
Sucker for punishment, aren't you? I spent about $5k with them over 3 years, they burned me once and I never bought from them again.
If B1 is 4.7v, its way over voltage. You need to wait for it to burn down to 4.2v, then charge again. This will need to be repeated many, many times unless you are willing to charge the low cells individually.
Chances are though, your battery is shot. If its that far out of balance, they were very poor quality cells in the first place
If B1 is 4.7v, its way over voltage. You need to wait for it to burn down to 4.2v, then charge again. This will need to be repeated many, many times unless you are willing to charge the low cells individually.
Chances are though, your battery is shot. If its that far out of balance, they were very poor quality cells in the first place
Sunder
10 MW
Just noticed b7 is only 1.3v
See if you can bring that one up to 4.2v and balancing should be a lot faster.
Chances that the pack will give you any reasonable kind of power is pretty low though. Maybe you can cut it out and replace just those cells. But now that some of the cells have gone as far as 4.9v, chances are they're going to die soon too.
I'd be keeping these outside in a fireproof box if I were you...
See if you can bring that one up to 4.2v and balancing should be a lot faster.
Chances that the pack will give you any reasonable kind of power is pretty low though. Maybe you can cut it out and replace just those cells. But now that some of the cells have gone as far as 4.9v, chances are they're going to die soon too.
I'd be keeping these outside in a fireproof box if I were you...
Thanks for the reply. Yeah, should have stopped a long time ago, but theyre so damn cheap :lol: (at least in the short runs)
EDIT:
Turns out my voltmeter had a bad battery, causing crazy readouts on voltage
Readings are:
1:4.1v
2:4.1v
3:4.1v
4:3.9v
5:3.8v
6:3.9v
7:2.38v <-----------Bad
8:4.1v
9:4.2v
10:4.1v
Total 38.6v
So I can try and charge #7 and see what happens.
EDIT:
Turns out my voltmeter had a bad battery, causing crazy readouts on voltage
Readings are:
1:4.1v
2:4.1v
3:4.1v
4:3.9v
5:3.8v
6:3.9v
7:2.38v <-----------Bad
8:4.1v
9:4.2v
10:4.1v
Total 38.6v
So I can try and charge #7 and see what happens.
So, I've slowly charged the #7 parallell group to 3.64v now. It takes forever since i only have a 116ma charger from a small Ryobi 4.v litium cordless screwdriver to charge it with :lol:
Can I attach the a new bms and let its balancing function do the rest? Since all the cells already are connected do I still have to get each parallell group balanced?
And how do I know all the 4 cells in a parallell is functioning? Can 1 cell be dead and the 3 others get overcharged by only charging a p4 group through the leads?
Can I attach the a new bms and let its balancing function do the rest? Since all the cells already are connected do I still have to get each parallell group balanced?
And how do I know all the 4 cells in a parallell is functioning? Can 1 cell be dead and the 3 others get overcharged by only charging a p4 group through the leads?
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