Sony PCV-RS100 - Manual (Page 46)

VAIO Computer System Reference Manual 30
About the Lithium Battery
The lithium battery starts to weaken after several years and the system settings,
such as the date and time stored in CMOS RAM, may become inaccurate.
Replace the lithium battery when this occurs.
Replacing the lithium battery
1 Write down any changes you may have made to the settings in the
BIOS Setup utility.
2
Shut down your computer and turn off all peripheral devices, such as
your printer.
3
Unplug your computer and any peripheral devices.
4
Remove the cover. See “Removing the cover” .
5
If necessary, remove any cables, add-on cards, or other components to
access the lithium battery.
6
Remove the old battery and install the new battery with the plus (+)
side up.
!
There is danger of the battery exploding if it is replaced incorrectly. Replace
the battery only with a CR2032-type lithium battery.