The Little Black Box II is lightweight and small enough to fit in your pocket and very simple to use. Comes with 4-18650 Lithium-ion Prismatic user replaceable, rechargeable cells 44.8 Watt hours which roughly gives you 10 additional hours on the iPad.
Simply plug in the Little Black Box II using the AC power adapter to finish charging. The LEDs with both light up with the power switch is on. When rechargeable cells are charging the LED to the right will be Orange indicating that the battery is in charging mode.
Normally, rechargeable batteries do not provide the right voltage for all Apple mobile devices. The circuitry boards used in the Little Black Box II design makes up for this, ensuring that your device gets only the juice it needs. No more and no less - without you having to do anything special to make it work, just plug your USB charging cable and flip the switch.This Little Black Box II charger works with: iPad, iPad 2 and the newest iPad, iPod Touch (1-4 generations), 30-pin iPod Nanos, iPhone 3G, 3GS, 4G & 4GS, any USB device 18650~Lithium-ion Prismatic rechargeable cells included!