Kmashi’s stupid-cheap battery packs have been incredibly popular this year, and their massive 20,000mAh model is down to $24 today. This battery actually comes with an optional dedicated wall charger that can juice up the entire battery in under four hours, which is far faster than you could recharge over USB. [Kmashi 20000mAh External Battery Power Bank, $24 with code AH9D5CYE]


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