Toshiba Portege M780 - Manual (Page 175)

User’s Manual 6-9
PORTÉGÉ M780
Maximizing battery operating time
A battery’s usefulness depends on how long it can supply power on a
single charge, while how long the charge lasts in a battery depends on:
■ Processor speed
■ Screen brightness
■ System Sleep Mode
■ System Hibernation Mode
■ Display power off period
■ Hard disk drive power off period
■ How often and for how long you use the hard disk drive and external
disk(c) drives, for example, optical disc and floppy diskette drive.
■ How much charge the battery contained to begin with.
■ How you use optional devices, such as a PC Cards, to which the
battery supplies power.
■ Whether you enable Sleep Mode, which can conserve battery power if
you are frequently turning the computer off and on.
■ Where you store your programs and data.
■ Whether you close the display panel when you are not using the
keyboard - closing the display saves power.
■ The environmental temperature - operating time decreases at low
temperatures.
■ The condition of the battery terminals - you should always ensure the
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:
Retention time
Battery type State and Retention Time
Battery pack
(51Wh, 6 Cell)
about 4 days (Sleep Mode)
about 40 days (Boot Mode)
Slice Expansion Battery
(44Wh, 6 Cell)
about 3 days (Sleep Mode)
about 35 days (Boot Mode)
RTC battery 30 days