HP ElitePad Expansion Jacket H4J85AA#AC3
To extend battery life up to 20 hours and keep working without recharging, snap an HP ElitePad Jacket Battery (sold separately) into the jacket before you insert the HP ElitePad. Note: Screwdriver (not included) required to secure battery.
Pass-through stereo sound on the jacket supports the HP ElitePad audio features so you can keep listening, while cutouts allow you to quickly dock in the HP ElitePad Docking Station (sold separately) for even greater expansion and connectivity.
HP ElitePad Expansion Jacket