Help to fault find on a Carrera Battery

[Baz the balloon man]

found this on u tube the exact battery and problem trouble is it in Polish or Russian I think .

 

[soundwave]

should be a auto translate button if it is not all mangled like German

 

[Baz the balloon man]

Attached is the colour combination of the Ten cell groups for this Carrera battery.

As of this morning I have the battery charged to 36.7 V charging directly to the terminal s that come up from the cells to the BMS.

I have no voltage across the Two terminals that the charge and discharge ports are connected too , but I have lights at the on and off power button.

once I have 40 V across the battery I am thinking about connecting it back together with control er on the bike and taking feeds back to the the input and discharge port terminals to see if this will kick start the BMS and clear the fault.

ANY REASON’S THAT I SHOULD NOT TRY THIS WOULD BE HELPFUL ?

If it does not work then any help changing the BMS to work the battery on an after market kit would be appreciated.

The battery is now at 40 V charging directly and the YOSE charger has gone from red to green

 

[Baz the balloon man]

Sorry 36 v
Damm just as I thought it was charging as it came up to fully charge I heard a small crack sound and now one cell group has gone down .
Black RS white Red LS yellow is now 0 volts

 

[matthewslack]

Sounds like a cell group has shorted out and so disappeared from the total voltage.

Unless there is an obvious explanation, I would disconnect it and treat it as dangerous scrap. If it is indoors, I'd take it outside.

 

[Baz the balloon man]

Thanks Mathew it’s dismantled and nothing connected BSM and all the connecting wires
and outside.

when I go to see the battery man I have found I will see if the rest of the cells can be salvaged.

It my own fault I was being greedy trying to fully charge it and not looking that the voltage on the shorted out cell group was out of balance to high to the rest 4.5V all the others 3.5V.

so when the charger went green this group was to high and shorted out.

I am gutted all my hard work down the pan especially as I am sure a new BMS would have finished the job.

Anyway a lesson learned.


Thanks again for your help

 

[matthewslack]

Thanks Mathew it’s dismantled and nothing connected BSM and all the connecting wires
and outside.

when I go to see the battery man I have found I will see if the rest of the cells can be salvaged.

It my own fault I was being greedy trying to fully charge it and not looking that the voltage on the shorted out cell group was out of balance to high to the rest 4.5V all the others 3.5V.

so when the charger went green this group was to high and shorted out.

I am gutted all my hard work down the pan especially as I am sure a new BMS would have finished the job.

Anyway a lesson learned.


Thanks again for your help

You've learnt a lot and not burnt the house down! And remember the cells may well be severely substandard from years of sitting flat, so not necessarily much lost.