HP Compaq nx9420, nw9440 Notebook PC - Getting Started - Enhanced for Accessibility

First-time setup
Step 1: Insert the battery pack
To insert a primary battery pack:
1. Turn the computer upside down on a flat surface, with the
battery bay toward you.
2. Slide the battery pack 1 into the battery bay until it is seated.
The battery pack release latches 2 automatically lock the
battery into place.
1–10 Getting Started