HP Smart Array P800 User Manual page 21

Position the batteries so that the pegs A on the underside of each battery are in the appropriate
b.
holes B on the controller board and pegs C are in slots D.
Slide the batteries toward the board bracket until they are firmly seated against the connectors
c.
on the cache module.
Secure the battery clip to the controller board:
12.
Swivel the clip over the cache module (1).
a.
Upgrading or replacing controller options 21