All the power bank will have only about 80-85% actual conversation rate due to power loss. A 5,600mah power bank will have only about 4,500mah actual capacity. However, it should be enough to recharge about 3 times of a iphone battery already (1,450mah) . Please refer this post for understanding.

This post has been edited by rabbitkiller: Feb 4 2014, 04:06 PM