Whether you spend a lot of time outdoors, or you just want to be prepared for an emergency, this 14W Anker solar panel can charge up two USB gadgets at once using the power of the sun. $50 is the lowest price we've ever seen by $10, and the 4.5 star review average is stellar for a product in this category. [Anker 14W Dual-Port Solar Charger with PowerIQ Technology, $50]

You could also use this to power up some external battery packs so you can keep charging at night. Here are several on sale.

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