I've had the EPOWER 2 for a few months now and it was working great until the micro USB connector used for charging the device snapped off and fell into the unit and fried something inside (it blinked twice and then showed no signs of life afterwards). Probably my fault for charging it standing up in my car with the USB cable hanging out of it, actually. So I did what I always do when something breaks and disassembled it only to be unpleasantly surprised to find the battery inside stamped with an 1800mah rating (well below the advertised 2200mah). A heads up for anyone considering this device or who has it. You can pop off one of the sides using just your fingernails or an iPod opener and check for yourself.