Toshiba Portege 4000 User Manual page 99

Running the computer on battery power
Sample Power Saver Properties Dialog Box
The Power Save Modes tab displays the remaining amount of
time for each of the different power usage modes.
With repeated discharges and recharges, the battery's capacity will
gradually decrease. A frequently used older battery will not power
the computer for as long as a new battery, even when both are fully
charged.
HINT: Wait at least 16 seconds after turning on the computer
before trying to monitor the remaining battery power.The
computer needs this time to check the battery's remaining
capacity and perform its calculations.
Power Management
99