I bought a 5600mAh external battery for my iPhone 5. It doesn't have an indicator of charge percentage (don't get smart, yes I know, iPhone shouldn't be mixed with non genuine Apple merchandise and all that jazz :)). How long should I charge it for on my wall outlet? And, how can I know how much is it charged, without buying additional equipment to measure that?
Your USB ports are probably supplying between 0.9 and 1.5 Amps.
Think of Amps as "amp hours per hour" or "thousand mAh per hour."
Therefore you should need to charge between 5.6/0.9 (3:45) and 5.6/1.5 (6:15)
For info on your specific configuration check out this site: