$20 is a very good price for any 20,000mAh USB battery pack, and this one actually includes a built-in solar panel to recharge itself. While that’s going to be much slower than recharging over microUSB, it can still top off the battery if you leave it out in the sun for a few hours, so it’s a nice little bonus. [ZeroLemon SolarJuice 20000mAh Fast Portable Charger with Solar Charging Technology, $20 with code Z36GZOGN]
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