Sony PCV-LX920 - Manual (Page 140)

To Replace 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. For detailed information on replacing the lithium battery, see the System Reference
Manual. You can download the System Reference Manual from the Sony Computing Support Web site at:
http://www.sony.com/pcsupport .
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