The ENERGI 10K is the perfect solution for someone looking for days of power. The huge 10,400mAh internal battery will fully charge your smart phone four times.buy here
Rechargeable 10,400mAh internal battery
Universal USB ports for charging most devices, including iPod®, iPhone®, and iPad®.
4.2 Amp rapid charging of up to 3 devices simultaneously.
LED light indicates remaining battery capacity.
Battery Cell: Lithium Ion
Battery Capacity: 10.4k
Output Voltage: 4.75V-5.25V
Output Current: 4.1A
Battery Charge Time: 6 hours
Dimensions: 24mm x 80mm x 120mm
Tech Bargains: "We found the Energi 10K to be one of the most useful and longest lasting batteries we have ever tested out. 4.5/5" go »