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User’s Manual 6-10
Power and Power-Up Modes
Maximizing battery operating time
A battery's usefulness depends on how long it can supply power on a
single charge.
How long the charge lasts in a battery depends on:
■ How you configure the computer (for example, whether you enable
battery power saving options). The computer provides a battery save
mode to conserve battery power. This mode has the following options:
■ Display auto off
■ HDD auto off
■ System auto off
■ LCD brightness
■ How often and how long you use the hard disk, CD-ROM and the
diskette drive.
■ How much charge the battery contained to begin with.
■ How you use optional devices, such as a PC Card, to which the battery
supplies power.
■ Enabling Resume mode conserves battery power if you are frequently
turning the computer off and on.
■ Where you store your programs and data.
■ Closing the display when you are not using the keyboard saves power.
■ Operating time decreases at low temperatures.
■ The condition of the battery terminals. Make sure the battery terminals
stay clean by wiping them with a clean dry cloth before installing the
battery pack.
Retaining data with power off (standby mode)
When you turn off your computer with fully charged batteries, the batteries
retain data for the following approximate time periods:
Extending battery life
To maximize the life of your battery pack:
■ If you have extra battery packs, rotate their use.
■ If you will not be using the system for an extended period, remove the
battery pack.
■ Store spare battery packs in a cool dry place out of direct sunlight.
Battery Approximately 3 days (Standby mode, 12-cell)
Approximately 2 days (Standby mode, 8-cell)
Approximately1 month (Shut down mode, both)
RTC battery Approximately 1 month