HP 421 Notebook-PC - Manual (Page 76)

2. Insert the battery into the battery bay (1) and push in until it is seated.
The battery release latches (2) automatically lock 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 latches (1) to release the battery.
3. Remove the battery (2) from the computer.
64 Chapter 5 Power management