Best of 2017: go green in the New Year with this waterproof solar charger

Save 72 percent on this portable sun trap and backup battery.

The Best of 2017 countdown celebrates the top deals this year in the PopSci Shop. On day three, we are going green with the Universal Waterproof Solar Charger. This portable device lets you charge your phone using sunlight or stored energy. You can get one now for $13.99, and take an extra 17 percent off with code BESTOF17.

While most backup batteries will keep you going for the day, few can last for an entire roadtrip. That’s where the Solar Charger comes in. This portable device soaks up the sun all day to charge your phone or tablet at night. In addition, the charger has its own 5,000mAh battery—so you don’t need to worry when the cloud rolls over.

The charger itself is pretty rugged, with a mountaineer clip for attaching the device to your backpack. The outer shell is both waterproof and shockproof, and you get dual USB ports (1A and 2.1A ports). If you love outdoor adventures, this charger can help you stay connected in the wilderness.

It’s normally $49.99, but you can get the charger now for only $13.99 with a choice of four colors.