Toshiba Satellite U500 User Manual page 144

Power and Power-Up Modes
M axi m i z i n g ba t t e ry o pe ra t i n g t i m e
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.
How much charge the battery contained to begin with.
n
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.
R et ain i ng da t a wi t h po we r o f f
When you turn off your computer with fully charged batteries, the batteries retain
data for the following approximate time periods.
Battery pack
(6cell, 12cell)
RTC battery
6-8
Approximately 2 days
(Sleep mode, 6cell)
Approximately 4 days
(Sleep mode, 12cell)
Approximately 5 days
(Shutdown mode, 6cell)
Approximately 10 days
(Shutdown mode, 12cell)
Approximately 3 months
User 's Manual