This handy solar charger and battery measures 6 x 6 inches and is only 3/4 inch thin and weighs just a hair over 5 ounces.
Coated in rubber, the BoostSolar features convenient fastener loops for attaching to your backpack. This solar-powered backup battery pack features a rechargeable 5000mAh lithium battery. When fully charged, you’ll have enough backup power to fully charge most smartphones twice. And with the 2.1A USB out you can also charge your tablet.
Press the button and the LED charge indicators will let you know how much battery charge you have left. The removable battery allows you to pop in another for unlimited backup power.