Charging The Battery Pack - HP Compaq NC6140 Hardware Manual

Charging the Battery Pack

The battery pack automatically charges when the notebook is
connected to external power. External power can be supplied
through an AC Adapter.
The battery pack charges whether or not the notebook is in use,
but charges faster when the notebook is off. Charging may be
delayed if a battery pack is much warmer or cooler than room
temperature. A battery pack normally charges in the notebook in
about 2 hours.
While the battery pack is charging, the battery light on the
notebook is on. The light turns off when the battery pack is fully
charged.
Identifying the battery light
Hardware Guide
Battery Pack
3–3