sn0wchyld
100 kW
Well. I'm one unhappy camper right now. I just discovered I've pretty much killed $300 worth of lipo.
I had my 24s 10ah pack all wired up still, but since I hadn't fixed my bike up, and I wasnt likely to any time soon, I'd removed the pack from the bike + disconnected the controller. The cells were all at ~3.8-3.9v, so no issues there, and I figured they'd be fine for a month or two, and had been checking them regularly for a while... well I checked them today, and the highest of em is at 3.5v. not so bad... though the lowest of them I can only get 50mV (yes, mV) out of a 4s pack. oh dear...
As it turns out I should have gone 1 step further. I had a small switch that turned my 12v power adapter on and off, and I think I must have left it 'on'... as the only other thing connected to the packs were the cell logs, and they'd been modified to be 'swich-off-able' and had next to no current draw in that mode (atleast, not enough to drain a 3.8v 10ah cell to 0 in a couple of weeks). So over the space of about 3 weeks (I've been crazily busy with uni) they've slowly been drained to 0
.
There's a small chance that I might be able to recover and use some again, as the cell logs power drain wasnt 100% even, so out of each string of 2 x 4s packs, one of the 4s packs has cells around 1.2volts, and each has 1 cell at 3.5 volts... basically I have 6 packs that are dead as dead... 50mV for each 4s pack, and 6 others that have ~5V for each 4s pack. since they've been drained down really slowly I might see if they can be saved, though I'm not holding my breath. If I cut the packs up I can get a single good 6s 5ah pack made from the 3.5v cells, out of the total 28cells that were there. errr.. yay :| ?
Not much else to say really. I'm just bummed that I let this happen. I had been checking on them once a week for about a month, and they'd been fine, so I must have accidentally hit the switch on the last 'check' before the 3 odd week gap. had I continued to check weekly, this wouldn't have happened. Guess thats the moral of the story eh? either A check regularly if they're in 'storage'... or if they're in storage, ideally, pull em apart completely. Which would have taken me about 30 seconds. No idea why I didnt. hence the title....
Im an idiot.
I had my 24s 10ah pack all wired up still, but since I hadn't fixed my bike up, and I wasnt likely to any time soon, I'd removed the pack from the bike + disconnected the controller. The cells were all at ~3.8-3.9v, so no issues there, and I figured they'd be fine for a month or two, and had been checking them regularly for a while... well I checked them today, and the highest of em is at 3.5v. not so bad... though the lowest of them I can only get 50mV (yes, mV) out of a 4s pack. oh dear...
As it turns out I should have gone 1 step further. I had a small switch that turned my 12v power adapter on and off, and I think I must have left it 'on'... as the only other thing connected to the packs were the cell logs, and they'd been modified to be 'swich-off-able' and had next to no current draw in that mode (atleast, not enough to drain a 3.8v 10ah cell to 0 in a couple of weeks). So over the space of about 3 weeks (I've been crazily busy with uni) they've slowly been drained to 0
. There's a small chance that I might be able to recover and use some again, as the cell logs power drain wasnt 100% even, so out of each string of 2 x 4s packs, one of the 4s packs has cells around 1.2volts, and each has 1 cell at 3.5 volts... basically I have 6 packs that are dead as dead... 50mV for each 4s pack, and 6 others that have ~5V for each 4s pack. since they've been drained down really slowly I might see if they can be saved, though I'm not holding my breath. If I cut the packs up I can get a single good 6s 5ah pack made from the 3.5v cells, out of the total 28cells that were there. errr.. yay :| ?
Not much else to say really. I'm just bummed that I let this happen. I had been checking on them once a week for about a month, and they'd been fine, so I must have accidentally hit the switch on the last 'check' before the 3 odd week gap. had I continued to check weekly, this wouldn't have happened. Guess thats the moral of the story eh? either A check regularly if they're in 'storage'... or if they're in storage, ideally, pull em apart completely. Which would have taken me about 30 seconds. No idea why I didnt. hence the title....
Im an idiot.
