Unfortunately, there is the following problem: identify According to the USB Charging Specification must be a device as a charger by the data pins D + and D- with a resistor
The Duracell device is soldered this resistance in the supplied cable (I've seen in my plug is broken). Is the included Micro-USB charging cable broken ('m to blame, but in a pocket on the way can something happen), is a spare cable on the open market not be obtained. With standard USB Micro-USB cables, in which the data pins are looped through to the opposite side, it did not succeed to load my Nokia 808 with the Duracell battery. With Nokia's own Micro-USB cable, it does not go well because the Nokia Steckernetztel resistance implemented already in the AC adapter and Nokia also provides only a normal Micro-USB cable. The Duracell Support not even though I have only described it understood my problem and has to really very much back and forth a replacement cable after all, sent free of charge. That is why, after all, there are three stars.
I would recommend the Duracell unit but only recommended for users who have to work anyway with the charger cable Handy-own (iPhone about - because the necessary resistance in the cable are implemented). So it will work. Who on the other hand needs a standards compliant mobile charger for use with standard micro-USB cable, which I recommend as an alternative the Belkin Power Pack 4000. Because the USB port is already in the battery pack properly executed and you can work with any standard USB cable work.