Solved how to check your cmos battery?

June 13, 2013 at 01:13:22
Specs: windows7 ultimate black&white, Intel Atom d945gclf
I want to know about how cmos battery works for a pc. And how to check is it damage .. Can i play my pc without cmos battery? This question is all about cmos battery. I want to know the answer from the experts

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June 13, 2013 at 02:20:34
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The cmos battery holds the charge for the cmos which is the part of the bios the user can change. CMOS (complementary metal oxide semiconductor) uses fleld effect transistors (FETs) at their voltage input. FETs have very high input resistance. In circuit analysis programs they're usually modeled as having infinite resistance. Because of this they pull very little current and that's why cmos batteries usually last for years.

Cmos batteries don't get damaged unless they're mishandled. As with any battery in use their rated voltage drops and eventually they need to be replaced. My experience has been that the 3 volt coin-sized cmos batteries most often used now will hold the cmos settings until their voltage drops to abouit 1 volt.

If you need to check the status of the battery just put a DC voltmeter to it. You don't really need to put a load to them when checking the voltage since their current draw is negligible and the meter input resistance is high.

You can run a PC without the cmos battery but because the cmos holds the date and time when the PC is off those features will default to the original bios date. So if for some reason you are running it without the battery--or with a dead battery--you need to set the date and time after booting the computer. Web certificates and some software will give errors if the computer date is too far off.

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June 13, 2013 at 02:23:20
If you suspect a faulty CMOS battery, replace it. They are cheap enough.

The only thing you can do to check it is to put a voltmeter on it. A new battery will be 3v.

You can run a PC without a CMOS battery but you ill need to go into the BIOS and change all the necessary settings every time you boot the computer; The CMOS battery is there to retain the settings in the CMOS memory while the computer is off.


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June 13, 2013 at 03:21:03
Thankx to both of you

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Related Solutions

June 13, 2013 at 10:59:48
If you take out the battery and measure its voltage without a load it could still read 3V even if it in sub-standard condition. In situ it is hard to test and could be influenced by an applied voltage - these cells, up to a point, respond to a charge.

The best way, as given, is to replace the battery with a new one - then you will be certain.

Always pop back and let us know the outcome - thanks

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June 14, 2013 at 11:09:52
The CMOS voltage is sometimes shown in the BIOS or thru monitoring software such as HWMonitor.

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June 18, 2013 at 11:56:13
As DAVEINCAPS has already implied, one of the best ways to tell that your CMOS battery is dying is that your PC clock will start losing time. When it's actually dead, your calendar will completely revert to the original PC mfg date. That's when you know you should really replace the battery (which is very easy to do).

1 Corinthians 15:3-4

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