Toshiba Satellite L640-BT2N13 Resource Manual page 27

To ensure that the battery maintains its maximum capacity,
operate the computer on battery power at least once a month. The
Lithium-Ion battery has no memory effect so it is not necessary to
let the battery fully discharge each time. However, for better
accuracy of the battery meter, it is helpful to fully discharge the
battery periodically. Please see "Maintaining your battery" on
page 31 for procedures. If the computer is continuously operated on
AC power, either through an AC adaptor or a port replicator (if
applicable to your system), for an extended period (more than a
month), the battery may fail to retain a charge. This may shorten the
life of the battery, and may cause the battery meter to be inaccurate.
The computer also has an internal real-time-clock (RTC) battery.
The RTC battery powers the RTC memory that stores your system
configuration settings and the current time and date information. It
maintains this information for up to a month while the computer is
turned off.
Monitoring main battery power
The computer's main battery light gives you an indication of the
main battery's current charge.
Glows amber while the main battery is being charged
(AC adaptor connected)
Glows white when the main battery is fully charged
Is unlit when the battery has discharged, the battery is not
charging, or the AC adaptor is not plugged into the computer or
AC outlet
Flashes amber when the main battery charge is low and it is
time to recharge the main battery or plug in the AC adaptor
TECHNICAL NOTE: Depending on your system, the RTC battery may
only charge while the computer is turned on.
Battery life and charge time may vary, depending upon power
management settings, applications and features used.
HINT: Be careful not to confuse the battery light
( )
light , and the power button light.
When the ON/OFF light or power button light flashes amber, it
indicates that the system is suspended (using the Windows
operating system Sleep command).
Mobile computing
( )
, the ON/OFF
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