About The Lithium Battery; Replacing The Lithium Battery - Sony VAIO PCV-RS310 Reference Manual

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VAIO Computer System Reference Manual

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.
!
There is danger of the battery exploding if it is replaced incorrectly. Replace
the battery only with a CR2032-type lithium battery.

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
5
If necessary, remove any cables, add-on cards, or other components to
access the lithium battery.
6
Gently push the battery holder's tab away from the battery and
remove the battery from the holder.
7
Install the new battery with the plus (+) side facing the battery
holder tab.
"Removing the Cover."