HP Notebook Series Reference Manual page 80

Troubleshooting
If you are using a power strip, remove the AC adapter from
the power strip and plug it directly into a wall outlet.
Make sure the battery pack is fully installed and locked in
place.
Make sure you are using only the AC adapter included with
your notebook (or other approved adapter that meets the
power requirements of the notebook). Do not use a 60-watt,
3.16-amp adapter.
Move the notebook away from any nearby heat source.
Unplug the AC adapter and allow the battery pack to cool
down. If the battery pack gets too hot, it will not charge
properly.
If available, try another battery pack and AC adapter.
If the Notebook Has a Short Operating Time
Conserve power using any of the suggestions listed in the
"Battery Packs and Power Management"
guide.
If you are running an application that has an automatic save
feature (such as Microsoft Word), disable this feature or
increase the specified save time to reduce hard disk access.
If the operating time has gradually become shorter and the
battery pack is more than a year or two old, you may need to
replace the battery pack.
Heavy modem use can impact battery-operating time.
PC Card use can impact battery-operating time.
Test and recondition the battery pack every 3 months.
6–16
chapter in this
Reference Guide