Yup, a couple years ago when I was into remote control toys, the lithium batts I used had to be charged in a blast container. It takes about two seconds to find a vid of these discharging on youtube. I doubt these are as bad today, but looking at a battery pack that thinks it's a jet engine might make people think twice. At least with these you don't have to wire them yourself and monitor heat and discharge rate. But you still need to respect the batteries.
