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With repeated discharges and recharges, the battery's capacity will
gradually decrease. In view of this it will be noted that an often used,
older battery will not operate for as long as a new battery even when
both are fully charged.
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
Solid State Drive power off period
How often and for how long you use the Solid State 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 USB device, to which the
battery supplies power.
Whether you enable Sleep Mode, which can conserve battery power if
you are frequently turning the tablet 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.
Whether you enable Sleep and Charge function.
Batteries exhausted time
When you turn off the power of your tablet with batteries fully charged, the
batteries will be exhausted within the following approximate period.
Retention Time
Battery type Sleep mode Shutdown mode
Battery pack (66Wh, 12cell) 6 day about 45 days or
longer
RTC battery 12 years 12 years
Extending battery life
To maximize the life of your battery packs:
PORTÉGÉ M930
User's Manual 5-6