If you've been waiting for a reason to pick up a big external battery, perhaps you should consider today's deal as a potential motivation. Right now we've got a coupon code that brings Anker's PowerCore II down to $34 over at Amazon. Not a bad price for something with a 20,000 mAh capacity that can charge over a pair of inputs at 4A, and spit 6A combined over three USB ports, with 3A max output per port.
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