The thing that comes to mind for me when I hear about mods exploding while charging, or any device for that matter, is what type of charger are these people using? For example I use Apple wall adapters for charging all my usb devices, it outputs 5VDC and 1 amp. When people buy those cheap knock off adapters they might be outputting higher/lower voltages and current than the
batteries are designed to take. It just seems too strange to me that under proper conditions a battery would explode, with the technology available today batteries are ridiculously safe with the exception of user error.