We often write about big battery pack deals here on Android Police: 10K, 15K, 20K, or as much juice as anyone could stick in these portable accessories. This deal is different. It's about a small 2000mAh battery that costs three Washingtons or less than a cup of Starbucks coffee.

But what good is 2000mAh really? It isn't enough to fully charge any modern smartphone even once so why bother with it? Well, this one measures 3.8 x 2.4 x 0.25 inches (9.65 x 6 x 0.63 cm) so it's small enough to fit in a pocket or the hidden zipper of a purse, and carry with you everywhere.

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