Apart from incorrect date & time, what are the symptoms of an almost flat CMOS battery?

6 Answers

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  • 6 months ago
    Favorite Answer

    NO MORE ABLE TO BOOT UP COMPUTER, OR COMPUTER BECOMES SHOWING NONSENSE ERROR, OR SOME COMPUTER CPU BECOMES SLOWER.

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  • Fulano
    Lv 7
    6 months ago

    The BIOS will start forgetting it's settings, so it will act like it's booting for the first time each time you turn it on. It's not a big deal if your system uses the default BIOS settings anyway, but if you have specifics that need set for it to run at it's best it'll be a pain to have to reset those every time you turn it off.

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  • John
    Lv 7
    6 months ago

    Measure it with a voltmeter to see if its ok.

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  • 6 months ago

    Open your machine and remove and reinstall the battery to wipe the contacts, or just replace the battery.

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  • 6 months ago

    CMOS (complimentary metal oxide semiconductor)

    is a low power consumption field effect transistor

    (ignore the above if you're a spell check victim)

    Nearly all batteries are Lithium ion.

    Many devices require a 3V Lithium

    button cell for memory retention.

    (BIOS, flash, etc.)

    These are not normally charged, and must be replaced

    periodically (by soldering with ESD precautions)

    Micro USB charging ports become fouled with dust,

    lint, and extraneous particulates, and require periodic dusting.

    You can't assume your device's power supply is charging because

    it's plugged in.

    Batteries normally last years, but lost time and date are

    symptoms of low battery output. Your device might

    have a battery health trouble shooter.

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  • 6 months ago

    CMOS is an IC type, it is not a battery.

    more details needed.

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