is there a battery in the computer - AVS Forum
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post #1 of 9 Old 05-26-2001, 11:08 AM - Thread Starter
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thank you CH, Thought it was one of those computer myths!!!!
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post #2 of 9 Old 05-26-2001, 11:20 AM - Thread Starter
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One more thing, what is the procedure for replacing the battery, will it effect the bios?I wouldn't think so considering it's stored on a chip, But just being cautious
wayne<FONT COLOR="White">Text</FONT c><FONT size="4">Text</FONT s>
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post #3 of 9 Old 05-26-2001, 11:33 AM
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If you replace the battery fairly quickly, the CMOS won't have time to discharge. Although technically not recommended, if you're dextrous and somewhat technically confident, you could change the battery with the computer on and you wouldn't have to worry about losing any settings. Standard CYA disclaimers apply http://www.avsforum.com/ubb/wink.gif

-will

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post #4 of 9 Old 05-26-2001, 01:36 PM
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Quote:
Originally posted by Hepcat:
If you replace the battery fairly quickly, the CMOS won't have time to discharge. Although technically not recommended, if you're dextrous and somewhat technically confident, you could change the battery with the computer on and you wouldn't have to worry about losing any settings. Standard CYA disclaimers apply http://www.avsforum.com/ubb/wink.gif
If the person is already losing the date settings, I'm fairly certain he's already lost all other BIOS settings as well. If the battery is already dead, take all the time you want. :-)

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post #5 of 9 Old 05-26-2001, 08:17 PM
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In my experience, for whatever it's worth, the date is the first to go. Although generally you start noticing lost time first...

On a negative note, you better hope that you don't have the integrated battery/BIOS. Those are a serious design flaw. With those your only option is to attach an external battery, assuming there's a jumper for one (unless you feel like soldering a new one, and *I* sure wouldn't solder a battery...) But those aren't as common as the coin cell battery.

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post #6 of 9 Old 05-26-2001, 09:22 PM
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Most motherboards have a battery that you can change. Depending on the motherboard and how old it is it may be in several different forms. The older systems had batteries that were a black rectangluar thing with wires that ran to the motherboard and plugged into a connector on the motherboard. Also, a few systems had rechargeable batteries that were mounted on the motherboard. Most newer systems use a small coin shaped Lithium battery that you'll immediately recongize and can be changed relatively easily. There were a few older systems (mostly 486 and early pentiums) that used a Dallas realtime clock and cmos memory IC that had the battery built into it. Some of these systems also had a connector that you could connnect an external battery to if the battery inside the IC went dead, but some of them didn't. On the ones that didn't in order to replace the battery you'd have to replace that whole IC and on some boards that IC was soldered onto the board. So, on those boards that could be a problem.

The Bios itself resides in a Flash rom on newer systems and an EPROM or one time progammable rom on old systems. Either way the bios itself resides in non-volatile memory and losing the battery won't lose the bios. The Bios settings, or cmos settings, that you set in your bios setup program are, however, stored in this battery backed up memory. So, if the battery fails you lose these and usually the bios will revert to the defualt settings.

What I'd recommend doing is just going into your bios setup program and write down all your currrent settings on a piece of paper. Then power the system down completely and change the battery. Then when you restart your system with the new battery in place you can re-enter your settings. It's usually a good idea to only work on a system with the power completely off. It's safer for you and safer for your computer. Also, you should of course take proper anti-static precautions.
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post #7 of 9 Old 05-26-2001, 09:37 PM
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Hi Cobbler:

___A small suggestion for you … You are more than likely going to lose the original BIOS settings when you swap out the battery anyway. If you only want to use the original BIOS settings, write them down as Stefan mentioned and reenter them afterwards. I however want you to think about optimizing your MB’s BIOS to make your PC perform even better if you have any leeway to adjust the various functions from the board you own. There are tens of web sites dedicated to BIOS settings. A few simple searches will lead you to exactly where you need to be. A few hours of reading and the BIOS is just another option to adjust the same as what driver or the HW you select for the particular outcome you wanted to achieve.

___Good Luck

___Wayne R. Gerdes
___Hunt Club Farms Landscaping Ltd.
___ xcel@midwest.idsonline.com

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post #8 of 9 Old 05-26-2001, 10:43 PM - Thread Starter
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hi, is it true that computers have a battery,a friend of mine has a computer that the date keeps switching back on him, If there is one....where is the dam thing???
wayne
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post #9 of 9 Old 05-26-2001, 10:54 PM
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You can't miss it. It is a silver button battery the size of 20mm diameter.

CH Yeow
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