Maybe solar isn’t your thing. Maybe you will need recharging while along side a running river. Heck, maybe you will be in some seriously windy areas. Time for a Waterlily Turbine Charger ($159) which uses wind/water power for charging up your USB devices. the waterlily weighs 2.86 lbs, can withstand water currents up to 6.8 mph, wind speeds ups to 55 mph, and even comes with a 2600 man battery bank. Not enough reviews to know what the masses think.