So I just killed my lipo pack...what to do now?

[zeropointbug]

Yup, that's the highly unstable graphite in the cathode reacting with the anode when the SEI layer breaks down. It might just slowly puff up when you charge it... the ultimately it will expand and very high risk of it exploding, and igniting. Guess what, it's hard to put a lithium cell fire out, because the oxidizer is right in with the battery.