Buy from Amazon.com : http://fave.co/19vBGPb
AspectSolar EnergyBar 250 High Capacity SunSocket Energy Bar 250 Watts per Hour Lithium Battery
Product Description :
Best in Class High Powered Safe Green Lithium Battery
3-5 Times the life of traditional batteries
No Memory Problems Extremely Long Shelf-Life
Multiple Versatile Power Outputs works with devices from around the world
40-60 lighter than traditional batteries
