Dell UJ499 Setup Manual page 7

Undocking Your Computer From the Battery Slice
1 Disconnect all the cables connected to the computer.
2 Flip the computer on its back.
3 Press the release lever and lift the battery slice from the computer.
Charging Your Battery Slice
You can recharge your battery slice independent of the computer using the
AC adapter that shipped with your computer. A docked computer will also
charge the battery slice.
Battery Slice
5