You would be surprised how many of our everyday electronics have li-po batteries. Charging is not as dangerous as some internet sites would have you believe. I do however charge my larger packs in an ammo can just because I don't want to sit and stare at them for a half hour while they charge. It's a pretty cheap way to C Y A, and puts me at ease that I'm not gonna damage one of the planes sitting around in the "hangar".