Charging A Battery Pack - HP Compaq NW8000 Hardware Manual

Charging a Battery Pack

All battery packs inserted into the notebook charge whenever the
notebook is connected to external power through an AC adapter
or an optional Automobile Power Adapter/Charger.
✎
An optional Aircraft Power Adapter can be used to run the
notebook, but it cannot be used to charge a battery pack.
A Battery pack can charge whether the notebook is off or in use,
but it will charge faster when the notebook is off. Charging may
be delayed if a battery pack is new, has not been used for 2 weeks
or more, or is much warmer or cooler than room temperature.
When a battery pack is charging, the battery light on the notebook
is on. The light turns off when all battery packs in the system are
fully charged.
Hardware Guide
Battery Packs
3–7