Yes, if you are modding the battery controller itself or if it (the controller) is so fragile that it blows up the battery on request (i.e.: on "wrong" input).

Yes, if you are modding the battery controller itself or if it (the controller) is so fragile that it blows up the battery on request (i.e.: on "wrong" input). In the first case: uhm, yes, you knew the risk? In the second case: Sue everyone from coder to distributer and take the refund from whomever is deemed finally responsible by courts.