Have you tried charging any other USB device with integrated cable and USB port? Is the USB-lightning cable OK? I've had problems wit mine not charging. The first LED just kept blinking for hours. The I figured out it is picky about charging cables from USB power brick.
By Janko Lupša on 10 April 2014
If your device has a wire that connects one end into your device and the other end had a USB connector, then it should work fine. Most devices that I have tested (iPad, iPhone, 3DS, Nexus tablets) all work and charge. CH
By C. R. Hill on 27 January 2014