IT-Arena.info: I've bought one of these and it simply sucks. It barely charges my phone while not in use about 1-2% every 10 minutes and it won't even charge 2600mah, maybe 1600mah. I've tested it both on my Galaxy S4 and Galaxy Nexus.
lee wee: Colours turn blue (some manufacturer use different led like green)
lee wee: No. it is either red (charging) or blue (fully charged)
lee wee: Plug a micro usb cable to a usb power adaptor or any computer with usb socket to charge
IT-Arena.info: Is there any way to check how much power is left in it?
Alex Rose: I've gotten the same one Amazon, it looks fantastic!
lee wee: colours will change
lee wee: the light will change to blue when it is fully charged