Naztech Apple Certified MFi Power Case for Apple iPad 2 Tablet - 9000mAh (11699) Slim Profile, Extends Battery Life Overcharge Protection, LED Battery Indicators Input: 5.1V, Output: 5V Miliamp: 9000 mAh, Battery: Lithium Ion Polymer Weight: Approx. 425g Protection: Short Circuit / Over Charge Compatible with: Apple iPad 2