docw009
1 MW
Last night I put a 48V charger by mistake on my 36V 10S-3P shrink wrapped pack. Worse, I had an XT60 adapter plugged into the XT90 discharge port, and thought it was the XT60 charge port. So no BMS protection.
I discovered my error a few hours later when I unplugged the pack, saw it was too warm and saw the wrong charger. Pulled shrink wrap and found most of the cells dead, but one group at 4.3 volts and the pack getting hotter, I put it in a cooler of ice water. It got cold. Added some salt. Tried to go to sleep.
This morning, the cooler was full of black water. I rinsed off the pack, and it started to get warm again. More ice water. Checked the cells. That one group had dissolved the nickel around the + terminals, and two cells were near zero, but the third was still at 4 volts and apparently still self heating. I removed that cell and will deal with it later. I think the other cells can be recycled.
Samsung GA cells, by the way. I'm glad they just died w/o drama while being overcharged. Careless, sloppy, I deserved worse, but I did go thru my usual drill or unplugging the charger before going to bed. Dumb luck. I'll take it.
I discovered my error a few hours later when I unplugged the pack, saw it was too warm and saw the wrong charger. Pulled shrink wrap and found most of the cells dead, but one group at 4.3 volts and the pack getting hotter, I put it in a cooler of ice water. It got cold. Added some salt. Tried to go to sleep.
This morning, the cooler was full of black water. I rinsed off the pack, and it started to get warm again. More ice water. Checked the cells. That one group had dissolved the nickel around the + terminals, and two cells were near zero, but the third was still at 4 volts and apparently still self heating. I removed that cell and will deal with it later. I think the other cells can be recycled.
Samsung GA cells, by the way. I'm glad they just died w/o drama while being overcharged. Careless, sloppy, I deserved worse, but I did go thru my usual drill or unplugging the charger before going to bed. Dumb luck. I'll take it.