Cellular Factory offers the 12-oz. 12000mAh Portable USB Battery Pack, model no. 58036-HB-105, for $37.99. Coupon code “1H0HUZ” grants free shipping. That’s the lowest total price we could find for such an item by $5, although we saw it for a buck less in March. It comes with several adapters suitable for most types of charging ports on portable devices.

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