Atomic Gear Gamma3 Portable Charger 2600mAh External Battery Power Bank with Built-In Charging Cable - Matte White Atomic Gear: Gadgets for the Adventurer in All of Us The Gamma3 has enough juice (2600mAH Lithium-Ion) to charge most phones and devices. Both input and output are 5V at 1.0A. This battery is lightweight and compact enough at 3.3 x 1.5 x 0.9 inches to carry in your pocket. The built-in cable works with iPhones and Androids that have micro USB ports. An additional micro USB cable is also included. Atomic Gear offers a lifetime warranty for all our products. If it stops working in 10 months or 10 years, we'll send you another one!