HP Compaq dc5100 MT Hardware Reference Manual page 41

Hardware Reference Guide
Type 2
a. To release the battery from its holder, squeeze the metal
clamp that extends above one edge of the battery. When the
battery pops up, lift it out 1.
b. To insert the new battery, slide one edge of the replacement
battery under the holder's lip with the positive side up. Push
the other edge down until the clamp snaps over the other edge
of the battery 2.
Removing and Replacing a Coin Cell Battery (Type 2)
www.hp.com
Battery Replacement
B–3