User’s Manual6-8
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:
n CPU processing speed (Depends on the model you purchased)
n Screen brightness
n Cooling method (Depends on the model you purchased)
n System Sleep Mode
n System Hibernation
n Monitor power off
n How often and how long you use the hard disk, optical disc.
n How much charge the battery contained to begin with.
n How you use optional devices, such as a PC Card, to which the battery
supplies power.
n Enabling Sleep Mode conserves battery power if you are frequently turning
the computer off and on.
n Where you store your programs and data.
n Closing the display when you are not using the keyboard saves power.
n Operating time decreases at low temperatures.
n 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
When you turn off your computer with fully charged batteries, the batteries retain
data for the following approximate time periods.
Battery pack
(6cell, 12cell) Approximately 2 days
(Sleep mode, 6cell)
Approximately 4 days
(Sleep mode, 12cell)
Approximately 5 days
(Shutdown mode, 6cell)
Approximately 10 days
(Shutdown mode, 12cell)
RTC battery Approximately 3 months