Amazon has the Poweradd Pilot 2GS 10000mAh Dual USB Portable Battery Pack for $21.99 (69.99 – 48 instant savings) with Free Shipping for a limited time.

The Poweradd Pilot 2GS USB portable backup battery features 10000mAh high capacity, dual USB (1.0A + 2.1A) for charging 2 devices simultaneously, aluminum body design to ensure lightweight and durability, and 12 months of warranty.