If you need a big external battery for traveling, camping, or to have around in case of an emergency, then listen up. Amazon has the Omaker 15600mAh Portable Charger Power Bank (and that's the abbreviated version of the product name, whew) with dual 2.1A output USB ports on sale today for $22.99 after applying a coupon code. That's a whole lot of mAh's for not a lot of money.
As far as power banks go, the Omaker is a pretty handsome device.
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