Aukey® external battery 12000mAh, external charger / external battery mobile dual USB, 5V / 3.1A emergency charger for iPhone, iPad, Samsung Galaxy and other smartphones, mobile phones etc. (BLACK) (Electronics)
External Battery good. Can be recharged about 3 to 4 times a Galaxy S5 with a single battery charge. With this, a full charge of the phone takes less than 2 hours against an external battery with 3:30 to 1 A. Size a bit too high (a little bigger than a Galaxy S5 and 2x thicker) but great design. Very convenient to charge two devices simultaneously through USB ports. In summary quite handy if you want very quickly recharge any USB device.