USTOP&trade;Light Green Heart Shape 2600mAh External Battery Backup Charger for iPhone 5,4S, 4, iPad 4, 3, 2, Mini, iPods, Samsung Galaxy S4, S3, S2,Thunderbolt, Incredible, Droid DNA, Motorola ATRIX, Capacity: 2600mAh Cell: 3.7V/18650 Input: 5V/1A; Output: 5V/1A Charging time: about 5 hours Cycle life: at least 500 times