Mophie has launched their new add on battery accessory for Samsung’s flagship Android smartphone, the Mophie Juice Pack, which is an add on case for your Galaxy S III with a built in battery.

The Mophie Juice Pack for the Samsung Galaxy S III features a built in 2,300 mAh battery, and according to Mophie, it can almost double the battery life of your Samsung Galaxy S III.

The Mophie Juice Pack for the Samsung Galaxy S III is now available for $99.99 and it comes in a choice of either black or white, you can find out full details over at Mophie’s website.