Your smartphones and other small gadgets may last you a few hours on a full battery charge, but you will have to charge them regularly. Solar chargers are your best friend when you don’t have any other way to charge your gadgets. The PowerBinder is a handy iPad holder with a solar panel on the front to harness energy for your gadgets. It also holds paper, handouts, and brochures.
PowerBinder can be charged with sunlight or via its micro-USB port. It has twin USB ports that can charge any USB supported device. The device also shows you how much juice the binder has left. You get a 5300 mAh battery that can charge most smartphones a couple of times. It can be yours for under $150.