Choiix's new pebble-shaped backup battery solution, Power Fort 5600mAh Rechargeable Battery Pack ($70), packs a powerful punch given how small it looks. Measuring 3.17" x 2.39" x 1.02", it's a good size for carrying around in a bag or purse, inside or outside the included storage satchel. One end has a Micro USB input for recharging the battery, while the other side has a full-sized USB output at 2.1A. Although Apple's products are heavily promoted…
