This well-reviewed (and obscenely popular) 10,000mAh external power bank from KMASHI can be had for just $9 today, which is about as good a deal as you’ll ever see on this sort ofthing. That’s enough power to recharge most smartphones about three times, making it perfect for long days at conferences, cross-country flights, camping trips and more. [KMASHI 10,000mAh USB Power Bank, $9 withe code ESVMTBOC]

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