Was it plugged in to the wall block that you use to charge your cell phone with when this happened? If so, this is more than likely the reason for the device to overcharge and explode. The wall block for a cell phone is 4-6 amps coming out of the wall, where as the device is only made to handle 1.5 - 2 amps for charging purposes. The device should only be charged with the following usb ports: laptop, desktop pc, x-box, playstation, or tv with usb port or wall block that is less than 2 amps. Some car chargers are also made just for cellphones, so make sure they are of the correct type to charge your device prior to use. Other than that, I can only speculate as to why your device self destructed.