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This Motorola Universal Dual-Charging Portable Power Pack drops from $39.99 to $9.99 at Motorola. Shipping adds $10, but even at $20 total, this is still the best price we could find for this universal batter pack by $5. It can provide up to 5 hours of extra talk-time and has a fold-able micro-USB cable and a USB input port making it compatible with any devices that charges using a USB cable. There is no sales tax.