HP 512424-001 - Manual (Page 52)

Removal and replacement procedures
Maintenance and Service Guide 4–7
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. Lift the front edge of the battery pack 2 until it rests at an angle.
4. Remove the battery 3 from the computer.
Install the battery by inserting it into the battery bay until you hear a click.