Meet the PowerTab: a portable solar charger that lets you charge smartphones, tablets, wearables, and other gadgets on the go. The 5-watt solar panel charges two cells (6000 mAh) with sun exposure. The device also has two LED lights in the back which you can use for reading at night.
This charger is powerful enough to recharge small gadgets as well as tablets. It can charge your smartphone in about 3 hours in sunny conditions. Costs $99.