If it doesn't measure at least 3.2V when you remove it from the package with a multimeter, it's an old battery. It will decrease in the first few days to about 3v (2.9), and is considered dead at 2.7V, although for the purposes we're talking about here, there's a third of its life left. Here in the US, Best Buy will take them.Ī Lithium primary battery at 3V is slightly discharged. If you unplug from the wall (or flip the PSU master power switch to off) and your motherboard forgets the date & time (and boot order), the first thing you do is replace the CMOS battery.Īnd BTW, those lithium batteries should be recycled, not tossed in the trash. That's common knowledge so can only assume jaggerwild was tired and suffered from cranial flatulence when he said otherwise. And one of its primary functions is to keep the RTC (real time clock) ticking when you unplug from the wall (or have a power outage).
And if the previous battery was dirty with grease/oil or other sticky contaminants, a good squirt with some quality electrical contact cleaner on the battery socket and contacts might be a good idea too.Īlso, ALWAYS remember to unplug from the wall and touch bare metal of the case interior before reaching in to discharge any static in your body first.Įxcept for them being 3.0V CR2032 batteries (not 3.3V - that's a PSU voltage), R-T-B is correct and the CMOS battery will indeed save OC settings. If you touched the new battery with your bare fingers, it might need cleaning. So I always put a clean sock over my hand.
#Replacing the battery on a construction master pro desktop skin
When inserting these batteries, you should NEVER touch them with your bare fingers as skin oils promote corrosion and attract dust. But you may need to take it back out and clean it. That depends on how dirty and what the dirt was. 3 - 5 years is normal but I've even seen them last 8 - 10.Īs for the battery being dirty, maybe. Of course they can die in that short of time! I've even had dead batteries right out of the brand new package! But normally they last years. I've pulled them from motherboards 10 years later, and they were still over 3V. If your power is terrible, we used to use a SOLA transformer to clean up the power they're pretty expensive, and run hot, so it may not be an option. With everything having a settable operating point, like video cards and such, maybe it draws more current. (a hand multimeter will not measure that current, so if it shows a current draw at all, something's bad.) It should be below ~5 microamps.ĮDIT: I see you're unplugging from the wall Modern computers use a bunch of standby current, up to 3A is the spec these days. If you think it's the motherboard, measure the current draw the motherboard is drawing from the battery with an ammeter. If there's a capacitor on that circuit, it may be shorting, and causing a problem, or dirt might cause a short, but it really should last 10 years. I've never personally had one die within ~10 years. Those batteries only supply a few microamps of current they don't really wear out, as much as age out after 5 to 10 years, when the battery material finally dies. (~3.3 is new, 3.7 is li ion chemistry, sorry.) They won't hold anymore at ~2.0V, so if the battery measures this or below, it's bad. To see if it's the battery causing the problem, measure the voltage of the battery with a voltmeter.
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