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Solve : How do I know the CMOS cell is faioing?? |
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Answer» WELL, I could just wait until I GET errors. But I go out my Voltmeter. It says 2.76 volts. The data sheet says it starts at 3.0 volts. So can I use this aged battery? Or should I buy a new one? And what if the new one does not hit very close to 3.0 volts? Doing Google searches, I did not find any battery maker tart would say for sure. What do you think? Curious minds need to know! 2.6 Volts or lower is "Dead" for the purposes of a CMOS Battery because it is below the cut-off for TTL/CMOS logic. You can either replace it now or later.Thanks, That sound good. On this computer it is giving me a low voltage alert about half of the time when I start in the morning. This computer is a real pain to service the CMOS cell. So I have some hesitation about using a aged cell tact is at 2.76 whee I would like 2.9 or higher. I am going to open it up now and measure the cell inside the box. Is it not a coin cell or just a pain to access? The warning is an indicator- likely designed to trigger when the voltage is approaching the 2.6V cut-off point. It shouldn't have any functional effect until you actually reach that cut-off, but of course the voltage will continue to drop. I don't think the CMOS nowadays really stores anything critically important for boot-up- it's mostly a few preferences. So whether you want to delay it or not shouldn't have a massive impact on how you use the system, unless the system is one of those ones that refuses to boot at all with a dead CMOS battery.So far it never lost anyt settings. So thealert was prematujre. The cell is a CR2032 and is hard to get to. have to slide out the hard drive and release a ssmall fan to get to the cell holder. I took out the cell and it have a NORMAL, but low voltage. But In the process I did something wrong. I saw a lot of dust and sprayed it away. But the spray I was using contained water. Bad MOVE! It took almost ahalf an hoer for the PC to come back to life. And I had pulled loose the VGA cable, which is the primary monitor. So I took almost an hour to get back here. I am using my Optiplex 745 Ultra small form PC. Picture of my dual monitor desktop Yeah, that little box is the 745 ultra tiny. I have Windows 10 running on it. And Windows 10 wants me to use the Dvorak keyboard! This is not my day! Moral: Always check the CMOS cell first! |
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