Toshiba Satellite C640 - Manual (Page 113)

User’s Manual 6-8
Power and Power-up Modes
■ The battery has completely discharged and been left in the computer for
a long time.
■ A cool battery is installed in a warm computer.
In such case, follow the steps below.
1. Fully discharge the battery by leaving it in the computer with the power
on until the power automatically shuts off.
2. Plug in the AC adaptor.
3. Charge the battery until the DC IN/Battery indicator glows green.
Repeat the steps two or three times until the battery recovers normal
capacity.
Monitoring Battery Capacity
Remaining battery power can be monitored in Power Options.
■ Clicking the battery icon on the Taskbar
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:
■ How you configure the computer (for example, whether you enable
battery-power saving options). The computer provides a battery save
mode, which can be set in Power Options, to conserve battery power.
This mode has the following options:
■ CPU Precessing speed
■ Screen brightness
■ Cooling Method
■ System sleep
■ System hibernation
Leaving the AC adaptor connected will shorten battery life. At least once a
month, run the computer on battery power until the battery is fully
discharged, then recharged the battery.
■ You should wait at least 16 seconds after turning on the computer
before trying to monitor the remaining operating time. This is because
the computer needs this time to check the battery's remaining capacity
and then calculate the remaining operating time, based on this
together with the current power consumption.
■ Please be aware that the actual remaining operating time may differ
slightly from the calculated time.
■ 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.