USTOP&trade;Blue frame-White slice 5600mAh USB Port External Charger Portable Power Bank Battery for Mobile Phone Droid, Google Glass, Nexus 4, Nexus 7, Nexus 10 Capacity: 2600mAh; Cell: 3.7V/18650 Input: 5V/1A; Output: 5V/1A Charging time: about 7-8 hours Cycle life: at least 500 times