HP EliteDesk 800 G2 Desktop Mini Hardware Reference Manual page 43

13. Lift the HDD cage out of the chassis (3).
14. Locate the battery and battery holder on the system board.
NOTE: You may need to use a small tool, such as tweezers or needle-nose pliers, to remove and
replace the battery.
15. Lift the battery out of the holder.
Replacing the battery 37