Backup battery power is great, but it still requires you to actually remember to charge the batteries. The Bolt2 from Flexmob fixes that conundrum by combining your everyday USB wall charger with a backup.
The charger features two USB ports, and a 6000mAh battery in the base that can store a charge for when you're not near an outlet. Plug it in and use as your daily charger while at home or work, and then grab it and go when you need on-the-road juice. The foldable wall prongs make the charger easy to throw in your pocket or bag, so you'll never run out of battery.