HP Compaq NX9008 Startup Manual page 6

Hardware and Software Setup
To set up the notebook:
1. Slide the primary battery pack into the battery bay until
it is seated.
NOTE: If you will not be using the notebook for 2 weeks or
more, removing the battery and storing it will prolong its life.
For more information, refer on the Documentation Library CD
to the Hardware Guide, "Battery Packs" chapter.
1–2 Startup Guide