KMASHI's 10000mAh external battery charger is slim enough that you can carry it around in your pocket and charge your phone at the same time, as long as you aren't bothered by the prospect of walking around with a little bulge. Last month we saw it available on Amazon for $9.50 after a coupon code. Now it's back, and by entering JAK3JCUV at checkout, you can get it for $9.40 instead.

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