If you work for extended periods of time away from an AC or DC power source, the slim Extended Battery is for you. Work up to a full day with minimal impact to size and weight (only adds 4.5mm to tablet thickness!). Hot Swappable – No need to suspend the tablet to change out batteries. Best of all, you can use both the Standard Battery and Extended Battery simultaneously, providing the ability to hot swap when more power is required. Spend less time charging your tablet and more time using it!