Batteries and Power Management
Using Battery Power
Reference Guide 55
To respond to a low-battery warning
The computer automatically alerts you when the battery power drops to a critically low
level. The computer first emits a high-pitched beep or displays a warning message. Then,
if you do not restore power within a short time, the computer goes into Hibernate mode.
Once the computer enters Hibernate mode in this way, you won’t be able to turn it on
again until you restore power by doing one of the following:
• Replace the battery with a charged one. See “Step 1: Install the battery” on page 20.
• Plug in the AC adapter. See “Step 2: Connect AC power” on page 22.
• Install a charged secondary battery in the plug-in module bay. See “To use additional
batteries” on page 55.
Note
If you plug in the AC adapter, you can continue to work while your battery recharges.
To recharge the battery
CAUTION
The AC adapter is normally warm whenever plugged into an AC outlet. The
computer is normally warm while recharging. Don’t recharge the computer in a
briefcase or other confined space, or its battery could overheat.
• To recharge the main battery, plug the AC adapter into the computer.
• To recharge a secondary battery, plug the AC adapter into the computer and insert the
battery into the module bay.
The main battery will recharge first, then the secondary battery will recharge.
To get the longest operating time, wait until the battery’s charge is below 50% before
recharging, then charge it fully (100%). Charging can take up to approximately 2 hours.
You can continue working while the battery charges.
A fully charged battery can operate the computer for up to approximately 4–5 hours,
depending on your computer’s model, power management settings, and level of use.
To use additional batteries
You can install a secondary battery in your computer’s plug-in module bay. See “Using
Plug-In Modules” on page 76 for information about installing plug-in modules. For
instructions on replacing the main battery, see “Step 1: Install the battery” on page 20.
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