Jolfstn74
1 mW
- Joined
- Sep 3, 2018
- Messages
- 19
from BatteryHookup.com I got 2 of the A123 48 cell packs and was breaking them into 6s4p modular packs for my e bike, had some balance wires on some hanging loose and stripped when I tripped on it, causing a short, causing a thermal runaway. I managed to get it off the wood floor inside the house and brought it to the yard, where in rapid succession lost 4 cells as they burst like firecrackers, tons of funky smoke and battery bits and fire. Never had that occur before. Pay attention when building battery packs to the risk of accidentally causing a short, when wiring a battery there really isn't a way to isolate the battery, once the main contact positive and negative bus and balance wires are on, it's hot. knock into it before you're done and anyone who saw the NASA robot fire knows these can be incendiary devices. Be aware and be careful. I was not burned carrying it outside but easily could have been, and I only lost 4 cells! considering what could have happened to my house, it's warped that the cells being lost occured to me at all, but if I'm being honest, yes it did. I got very lucky. Not hurt, house structure fully intact. I've heard it said to think of lithium batteries basically as 2 oz cylinders of gasoline. I had a first hand lesson as to why.