your biggest issue I think is the endpoint voltage of the lipo battery when fully charged lipos top out at 4.2 volt per cell. high voltage ones might top out at 4.35 volts per cell so 3 cells times 4.35 = 13.05 volts (instead of 12.6 volts for normal lipo) you should read up on how to charge a lipo, if you get it wrong, you could burn down your house. they use a constant current and constant voltage controllers.. to keep things within safe limits.