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Failed CMOS battery? Again?
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[QUOTE="Paul, post: 14242615"] You could connect a much larger battery to it. But that's soldering iron / hardware hacker type stuff. You need to use a battery with the correct voltage. (Voltage can't be too high, or the battery ends up "running the PC" all day :-) ) You'd locate something like this, check out the maH rating (i.e. to work out how many months it'll work), double-check the voltage is no more than CR2032 working voltage (must be more than 2.3V min). Buy a battery holder, a couple of wires. And be damn careful not to short something. Solder battery holder in parallel with CR2032 socket (access solder points on back of motherboard.) That particular battery is for running digital cameras with high drain, so has a relatively good peak current rating. If you short a battery like that, who knows, it might begin to swell. I would probably add a small series resistor, like 100 ohms, right on the battery terminal output, so a downstream short couldn't pop anything. [URL]http://www.all-battery.com/cr123_indvidual.aspx[/URL] When I was a kid, and playing with batteries in the basement, I managed to develop enough current flow in dry cell batteries, to make the positive electrode "swell" and push out of the battery case. (Try putting about 30 batteries in series...) You don't want to be doing stuff like that. The reason nothing bad happened to me, is they weren't Lithium. I would think putting a fresh CR2032 in there, and leaving the power switch on the back of the computer in the ON position, should lengthen the time it lasts. If it does not, that tells you the fault is very close to the battery itself (socket, 1K resistor, or problem at or near the three-legged ORing diode BAT45C or similar). If the fault is further downstream, the ATX PSU takes care of it. The only thing that really stands out in circuits like that, is the SuperI/O hardware monitors that have a VBAT pin, for monitoring the CR2032. That's a possible place for draining the battery to happen. The CLR_CMOS jumper is another candidate location. Inspect for dirt or solder splashes or tin whiskers. The rest of it, the CR2032 socket, 1K resistor, ORing diode, probably not as likely. Have you ever used the CLR_CMOS jumper before ? If so, did you leave the system powered when doing so ? On some systems, this damaged (burns) the three-legged ORing diode. And your leak could be there... Paul [/QUOTE]
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Failed CMOS battery? Again?
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