A few questions...

Uhm so i have a few questions regarding this brushless lark...

1) my Trakpower 4900 2s lipos have recently puffed after charging and i do not know why. Is it still safe to use em?? They are only puffed about 1/8th inch but with no reason, the charger is always charging at 1c.

2) my lvc is set at 3.4v, is this enough or does it need to be higher? The truck is a savage x converted with an mmm 2200kv combo?

3) would it be ok to drill soem holes in the body shell's windshield to get some air flowing over the motor and esc..

Thanks guys