Last night while charging my big 20C 4S1P 4500mA, I thought I’d better use the sack as cell voltage was a touch below 3.2v/ea. So I started a long .5 amp trickle charge. Checked on it twice before going to bed. Woke up to this…

Garage a huge mess of ash. LipoSack probably saved my house from burning down as you can see the wall got a bit torched even with the sack. Thank you LipoSack!