The remedy here battery pack as the power bank from PowerAdd. The part is virtually a portable socket for devices with mini USB port. The Power Bank, here in the 10.000mAh version makes outwardly a very good impression. There is an On / Off switch, four white LEDs indicating the charge status of the power bank, of course, a mini-USB cable to charge the Power bank or even recharge a smartphone. The housing is in aluminum and has 2 USB sockets.
Recharging the Power Bank has been going on scarce 6 hours then the unit. Which is about as big as a HTC One, but also brimming with energy.
To test the Power Bank has been fully charged and then fully discharged at two smartphones (HTC One (M8) / Huawei G615) connected. Both smartphones are fully charged and the power bank was still charged just under half
Since you can not complain!