Reviving a 36V Li-ionDead Battery

[Lawman]

Yes that is fine. You will get a short if you put the electrode across a gap between two cells in series, but otherwise you will be fine. Look at where the red wires go on the cells and put the electrodes on the part of the cells where they are, They should alternate from one side to the other.

If you can, try and force the multimeter to read volts. I don't like these auto detect modes.

Perfect, thank you!

I found another mutimeter and it can read volts, with no auto detect.

B1: 0.1 volts
B2: 0.1 volts
B3: 3.8 volts
B4: 7.6 volts
B5: 11.5 volts
B6: 14.6 volts
B7: 18 volts
B8: 22 volts
B9: 3.3 volts

 

[WheezyRider]

Perfect, thank you!

I found another mutimeter and it can read volts, with no auto detect.

B1: 0.1 volts
B2: 0.1 volts
B3: 3.8 volts
B4: 7.6 volts
B5: 11.5 volts
B6: 14.6 volts
B7: 18 volts
B8: 22 volts
B9: 3.3 volts

You are missing one reading, and it's odd B9 doesn't follow the sequence, are you probing that last one separately and not with reference to B-?

Anyway, it looks like banks 1 and 2 are dead. I think you need to buy another pack and just salvage the good cells left in this pack for making USB power banks...

 

[Lawman]

You are missing one reading, and it's odd B9 doesn't follow the sequence, are you probing that last one separately and not with reference to B-?

Anyway, it looks like banks 1 and 2 are dead. I think you need to buy another pack and just salvage the good cells left in this pack for making USB power banks...

Okay thanks.

Would this do as a replacement do you think? It's about the same physical size but 7Ah instead of the 4Ah. I take it the BMS on that will be different, does it matter?

Aleaivy new 36V 7Ah 10S2P 18650 Rechargeable battery pack 7000mAh modified Bicycles,electric vehicle 42V Protection PCB Aleaivy

I probed B9 referencing to B-, it looks like B9 is almost dead too then.

 

[vfr400]

Okay thanks.

Would this do as a replacement do you think? It's about the same physical size but 7Ah instead of the 4Ah. I take it the BMS on that will be different, does it matter?

Aleaivy new 36V 7Ah 10S2P 18650 Rechargeable battery pack 7000mAh modified Bicycles,electric vehicle 42V Protection PCB Aleaivy

I probed B9 referencing to B-, it looks like B9 is almost dead too then.

I wouldn't use one of those. they're full of recycled cells. Buy one with new cells.

 

[WheezyRider]

Okay thanks.

Would this do as a replacement do you think? It's about the same physical size but 7Ah instead of the 4Ah. I take it the BMS on that will be different, does it matter?

Aleaivy new 36V 7Ah 10S2P 18650 Rechargeable battery pack 7000mAh modified Bicycles,electric vehicle 42V Protection PCB Aleaivy

I probed B9 referencing to B-, it looks like B9 is almost dead too then.

That link would be a total gamble, and the cells would most likely not be 3500mAh, and even if they are, can they supply the amps you need? In your application you need high quality, high capacity cells that can supply a decent amount of amps. Otherwise your scooter won't go far and the pack won't last very long.

Do you know the rated number of Watts you have for your motor?

 

[Nealh]

Yes don't buy.
For a 2p battery you will want v.good cells min 20a rated, pucker cell's are at least £4 - £7 each.
What current is the board drawing ?

 

[Lawman]

That link would be a total gamble, and the cells would most likely not be 3500mAh, and even if they are, can they supply the amps you need? In your application you need high quality, high capacity cells that can supply a decent amount of amps. Otherwise your scooter won't go far and the pack won't last very long.

Do you know the rated number of Watts you have for your motor?

According to the manual it has a 200 watt motor. It comes with a small remote that allows you to switch from a lower speed to a higher speed with around 9 miles distance on a 2.5 hour charge.

 

[Lawman]

Yes don't buy.
For a 2p battery you will want v.good cells min 20a rated, pucker cell's are at least £4 - £7 each.
What current is the board drawing ?

Now your asking! I’ll try find out.