Why does CMOS BATTERY LOW keep showing?

Gateway One all-in-one desktop with inte...
March 3, 2011 at 22:02:49
Specs: WinXP, 1.80GHz
My computer keeps shutting down randomly and I have to keep turning it back on. When I do so it says "CMOS BATTERY LOW" and "DATE AND TIME NOT SET". I tried switching the CMOS battery (3v CR2032) with another computer's to see if that may help since that battery isn't brand new but should be good enough since that computer turns on fine. The same thing pops up and it still turns off randomly. Do I need to buy a brand new battery or is it my motherboard? If it's the motherboard how do I change it and get another one? Here's my computer's info:


Computer Type ACPI Uniprocessor PC

Operating System Windows XP Professional

Motherboard info:

CPU Type Intel Pentium 4, 1800 MHz (18 x 100)

Motherboard Name Intel Pendleton D845PT (3 PCI, 1 AGP, 2 DIMM, Audio)

Motherboard Chipset Intel Brookdale i845D

System Memory 512 MB (PC2100 DDR SDRAM)

Until this problem my computer's been running pretty good. Thanks in advance for any help.

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March 4, 2011 at 06:20:24
Is the motherboard free of dust? Dust can be a high resistance short that may reduce the voltage.

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March 4, 2011 at 07:24:30
The CMOS battery stores the settings in the BIOS that are adjustable. When the battery can't do that job any more those adjustable settings (CMOS) fall back to the defaults. The default date and time are when the version of the BIOS included in your motherboard was written.

So, changing the battery may now allow the settings to be retained. However, you did not adjust those settings.

The proper procedure is to first uplug the computer. Install a fresh battery.
Reconnect power and restart the computer. Immediately enter the BIOS (setup) screens and reset the values as necessary. For you purposes the very least you need to do is set the date, time and boot order. There may be other settings in need of adjustment depending on your system.

Until you reset the date and time the message will continue to appear.

Buy a new battery, they are cheap and readily available everywhere. Be sure to follow the above instructions and take care to install with the correct polarity facing up.

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March 4, 2011 at 22:47:03
Thanx everyone. I bought a brand new battery and changed the settings in BIOS (date and time) and it's still cutting off. I even switched hard drives. It was running for several hours then it cut off out of nowhere again. Any suggestions? If it's a hardware problem what should I do? If it's the mobo how do I fix/change it? Is it a possible power source, fan or similar problem? If so how do I fix that? Thanx in advance!

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Related Solutions

March 5, 2011 at 04:04:58
Are you sure the battery is not installed backwards?

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March 6, 2011 at 14:35:57
The battery is installed correctly. Ever since I replaced the battery with a new one it stays on longer then shuts down. Here's the pattern. It's a steady green light by the on/off button when it's running fine then the light turns orange indicating that it shut down. I have to press and hold the off/on button until the orange light turns off. When it does I have to keep pressing the test switch button over the fan until the fan turns steady on it's own and the computer powers up. Then I press the on/off button and it turns on with the green light going straight to BIOS all over again. I make the adjustments and then it starts up correctly. After a little while it shuts down all over again and the cycle repeats. If I let it stay off for several hours it stays on longer before it shut downs. If I restart it right away it turns off after several minutes. I know It's not the battery. It has to be something else. Any help would be appreciated. Thanx!

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March 6, 2011 at 15:58:22
Are the contacts for the CMOS battery tight. Removing the battery can loosen them.

Are you saving the settings when exiting the BIOS screens?

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