Having problems with your HP Compaq Presario C502US Notebook ?
3V laptop Battery
\015 I'm wondering what the small, round 3V Mitsubishi battery that is inside my laptop is used for? Please let me know. Thanks.\015
That's the CMOS backup battery. Some of the motherboard settings (the system clock and date, for instance) are stored in CMOS memory, and some power is required to keep the contents alive. If the battery goes dead (which it will, someday), you will get error messages when the computer starts up. All you need to do is pop in a new cell and set your clock again.
It keeps your bios alive while your comp is turned off your bios is what tells your pc how to start
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