HP ProBook 6555b Notebook-PC - Manual (Page 79)

2. Insert the battery (1) into the battery bay until it is seated.
The battery release latch (2) automatically locks the battery into place.
To remove the battery:
1. Turn the computer upside down on a flat surface, with the battery bay toward you.
2. Slide the battery release latch (1) to release the battery.
3. Remove the battery from the computer (2).
Charging a battery
WARNING! Do not charge the computer battery while you are onboard aircraft.
Using battery power 69