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Batteries and Power Management
Using Battery Power
Reference Guide 33
To respond to a low-battery warning
The notebook automatically alerts you when the battery power drops to a critically
low level. The notebook first emits a high-pitched beep or displays a warning
message. Then, if you do not restore power within a short time, the notebook goes
into Hibernation.
After the notebook enters Hibernation in this way, you will not be able to turn it on
again until you restore power by doing one of the following procedures:
• Replace the battery with a charged one.
• Plug in the AC adapter.
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
notebook is normally warm while recharging. Do not recharge the notebook in
a briefcase or other confined space, or the battery could overheat.
Plug the AC adapter into the notebook.
To get the longest operating time, wait until the battery charge is below 50 percent
before recharging, then charge it fully (100 percent). Charging can take several
hours. If you continue working while the battery charges, the charging time may
increase.
The operating time for a fully charged battery depends on the notebook model,
power management settings, and level of use.
To get the most from your batteries
Follow these suggestions to make your battery power last as long as possible:
• Plug in the AC adapter, especially when using a CD-ROM or DVD drive, or any
external connections such as a PC Card or a modem.
• Set the display brightness to the lowest comfortable level (Fn+F1).