inputs.text: excellent portable battery one flaw - unit good one flaw delivers approximately 80 rated capacity still not understand widespread use overly optimistic ratings field external mobile battery devices industries seehem rate batteries correct capacity several radio controlled helicopters airplanes buy build battery packs good quality batteries used delivered rated capacity better nt70t also great form factor reasonably light stated capacity sets device apart ability charge three devices integrated usb micro usb cords one best features mobile battery not know not implehemented many devices handy not carry search usb charging cable four led lights display capacity not accurate capacity delivered halfway indication two lights find two lights four left battery much less half capacity one thing would ask manufacturers design better charge rehemaining indicators new trent nt70t one best mobile battery packs tested