Before installing, you should have a charged VEX EXP Battery.
Install the Battery
Slide the Battery into the VEX EXP Brain and listen for a click that indicates the Battery has been inserted correctly and completely.
Remove the Battery
Squeeze the latch at the end of the Battery and pull it out of the Brain.
NOTE: Pushing on the Battery from the other end helps in removing it.
NOTE: The Battery should always be removed from the Brain if it is going to be stored for longer than two weeks.