iGo Portable Battery 4700 Lithium Polymer 4700mAh 5V rechargeable battery

4700mAh, Lithium Polymer, Micro USB, LEDs, 110g The iGO Portable Battery 4700 is engineered to charge a smartphone up to three full times before needing to recharge, and it is powerful enough to provide extra juice to tablets and eReaders. There is no need to search for an outlet - this product works without being plugged into a power source. Charge it up using any USB power source and take it with you for power on the go.