Cmos battery failure pls help me

February 17, 2012 at 06:37:15
Specs: Windows 7, pentium dual core speed 2.50GHZ / 2GB ram
Dear all

in my system continously cmos battery failure (within 2 days or one month)
this problem i cannot identify pls help me ...... bettery holder problem or
motherboard problem... mail id -(
any no that problem PLS send mail

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February 17, 2012 at 06:41:06
plz dont post ur email as this forum is open and may result u to get spam.
ur problem seems very obvious u have a bad cmos battery failure its the compartment on the motherboard that looks just like a rounded battery it stores the system date and time as well as bios configuration.
when this battery dies then ur system will have trouble booting or will shutdown, u need to replace the battery asap its cheap.

computers are a second home

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February 17, 2012 at 07:57:29
It's NOT a good idea to leave your email address in a post anywhere on the web - there are malicious people and malicious programs that are constantly looking for email address to abuse. You should delete it.
You can Edit any of your own posts on this web site, for a limited time, by clicking on the the Edit this message link at the bottom of your own posts.

Do you have a desktop computer, or a laptop or netbook ?

I'm assuming you have a desktop computer, gong by the sparse information you're provided.

Cmos batteries for desktop mboards typically last about 5 years.
It's a coin shaped battery on modern mboards that is installed in a metal or metal lined socket that is either flat on, or vertical to, the mboard

If you haven't replaced it, replace it.
There is a clip or lever on one side of the socket you move toward the outside of the socket to release it from it's socket.
Local places that have all sorts of batteries probably have the same battery "number" or a clone of it. Even some "dollar" stores have them.

If you HAVE replaced it, if you are still getting messages about a failed battery....

- the battery must be installed so that it's polarity is correct. The + sign on the battery's surface should be visible when it has been installed. If the battery is upside down in the socket, the moard's bios will "think" the battery has not been installed or is dead.

- the contact in the metal socket that touches the top (+) surface of the battery may have been bent such that it's getting a poor connection or no connection. If that contact is bent, remove the battery, bend the contact toward the bottom of the socket, then install the battery again so that the + shows when it's installed.
( If the battery is in a vertical socket, you may not be able to see the + when the battery is installed - that + side must be toward the side of the socket where you can see a contact in the middle on the inside of the socket.)

- rarely, there may be corrosion in the socket that is making the connection of the battery to it's socket poor - usually in that case you will see whitish or grayish deposits on the metal of the socket. If you clean off the corrosion, the battery not being detected properly should go away. Usually if you use a bit of vinegar on something such as a cotton swab (q-tip) to clean the socket and the underside of the top contact, that will work fine - remove any excess vinegar - the socket must be dry when you install the battery.

- if you have moved the clear Cmos jumper on the mboard to the position for clear,or have removed it, you must move it back to the position for normal or similar, or install it again, otherwise you MAY get a message about the battery. .

After you have removed the battery and have installed a good one in the right direction, or after you have cleared the Cmos by moving a jumper on the the mboard and have moved it back to the "normal" position, you will get a "Cmos checksum error" or similar when you boot the computer. The message is generated because bios defaults have been loaded, including the default original date and time. To get rid of that error, you must go into the bios Setup and set at least the current date and time, Save bios settings. In some cases, you also have to change default bios settings for other things as well.

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