Take this EnerPlex Jumpr Prime 4400 JUPRIME44 lithium-polymer external battery with you on the go in your bag or pocket for an extra charge you don't have access to an outlet. Dual 1.5-amp USB outputs let you charge up to 2 devices simultaneously.
Battery: Lithium-Polymer: 4,400 mAh/3.7V Dimensions: 3.9 x 1.8 x 1.0 in. Input: Micro-USB Port Power Output: 1A/1.5 Amps Weight: 0.3 lbs. Output: Dual USB Port