Compaq Presario,Presario 1211 Supplementary Manual page 85

The battery will charge
whether your Notebook is on
or off, and will continue to
charge until the battery is
fully charged or AC power
is disconnected.
The battery operating time depends on your power
management settings. Your Notebook components, the
options, and the applications that you use also affect the
operating time. This section of "Caring for Your Battery"
shows you how to increase the length of time you are able to
operate under battery power.
The display, processor, CD/DVD drive, and hard drive use the
most battery power. To maximize the battery operating time,
perform one or more of the following actions:
• Reduce display brightness and select a short wait for your
screen saver.
• Select a screen saver that does not generate a lot of
graphics or motion.
• Reduce audio volume or use headphones.
• Exit modem programs when you are not using them.
• Remove PC Cards when you are not using them.
• Remove CDs or DVDs when you are not using them.
• Use Sleep or Hibernation mode to turn off your Notebook
when you are not using it.