Samsung offers its Samsung 3,100mAh External Battery Pack in Black, model no. EB-P310SIBESTA, or White, model no. EB-P310SIWESTA, for $59.99. Coupon code XTRACHRG cuts it to $9.99. With $3.95 for shipping, that's the lowest total price we could find by $3. It features a built-in Micro USB charging cable.

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