Toshiba Satellite U840 - Manual (Page 81)

Battery
This section explains battery types, use, recharging methods and handling.
Battery types
The computer has different types of batteries.
Battery pack
When the AC adaptor is not connected, the computer's main power source
is this lithium ion battery pack, also referred to in this manual as the main
battery.
Real Time Clock (RTC) battery
The Real Time Clock (RTC) battery provides power for the internal real
time clock and calendar function and also maintains the system
configuration while the computer is turned off. If the RTC battery becomes
completely discharged, the system will lose this information and the real
time clock and calendar will stop working.
You can change the Real Time Clock settings by turning on the computer
while pressing the F2 key and then release F2 key when the TOSHIBA
Leading Innovation >>> logo screen appears. Please refer to Chapter 6
Troubleshooting for further information.
The RTC battery does not charge while the computer is turned off even if
the AC adaptor is attached.
Care and use of the battery pack
This section provides the important safety precautions in order to handle
your battery pack properly.
Refer to the enclosed Instruction Manual for Safety and Comfort for
detailed precautions and handling instructions.
The computer's RTC battery is a lithium battery and should be
replaced only by your dealer or by a TOSHIBA service representative.
The battery can explode if not properly replaced, used, handled or
disposed. Dispose of the battery as required by local ordinances or
regulations.
Charge the battery pack only in an ambient temperature between 5
and 35 degrees Celsius. Otherwise, the electrolyte solution might leak,
battery pack performance might deteriorate and the battery life might
be shortened.
Satellite U840/U800 Series
User's Manual 5-3