seen a few soft cased flight packs damaged in crashes, bloated ones, even punctured but only know of one catching fire on anything other than overcharging. i know this i a bit silly but i did try to ignite a failing flight pack. i gave it a few good hits with a hammer, no effect, shorted it out and it puffed slightly, recharged it for a bit then put a screw through one cell, shot it with an air rifle, no effect. nimh charger at 7A for about 40 mins had it spitting and frothing eventually. i do know of someone however who merely dropped a pack onto tarmac, after 10 mins it was puffed, after 20 it had combusted. i think the toughness of the cells must vary greatly on construction and type, mine was an older 10c pack, his was a newer 25c, more volatile chemistry??
|