For me, another highlight of RAVPower. To have 16,000 mAh addition here is already a good feeling. As already noticed other reviews on this unit correctly, it is faster than a power charger and bound by short-circuit and overvoltage protection also very safe. Due to size and weight, it is now not necessarily suitable for your pocket but this capacity is required, the corresponding cells. The price-performance ratio is excellent. I can only recommend this External Battery !!!