it puffed all the sudden after one run (not horribly but was never puffed before) , i let it sit for 2 heats then balanced it. no problems at all, it wasnt horrible and ive ran and seen many puffed packs before, i wasnt alarmed by the size just a little bummed out like i said, it wasnt huge or anything. . plugged it in just fine no problems, but when i switched it on a minute later.. pop! everything dead
my buddy had this happen to a new hobbywing v3.1 too.