So you want to have a way to charge your smartphone or e-reader when you are on the go? The Bushnell PowerSync USB Charger can help. It is a compact, lightweight unit with dual 2200 mAh batteries to charge your smartphones, e-reader, or GPS device. This can be charged from a USB power source in 6 hours. You get dual USB outputs that should work for any USB powered rechargeable device.
This gadget charges quickly and enables you to carry extra power with you everywhere you go. It is under $80 at this time.