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What is a cmos battery in a computer - HP Compaq Presario SR1230NX (PJ518AA) PC Desktop

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A cmos battery retains the settings in the bios. It is a small battery like a watch battery usually a cr2032 battery.

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Cmos battery


Open the computer case and find the battery on the computer Motherboard, verify that it will be accessible and that it can be removed. Most computers today use a coin cell CMOS battery the number and verification should be mounted on the CMOS battery.

Apr 04, 2013 | Sony Computers & Internet

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How to verify that the CMOS battery needs to replace


<p>The CMOS battery is named after the Complementary Metal Oxide Semiconductor power. The CMOS has the current date and time functions for desktop and laptop computers. It allows the computer to automatically adjust the time, even on computers that are disconnected for long time. When a computer no longer has the date and time and forget it on every boot, the CMOS battery probably needs replacing. Some computers have messages when the battery is weak, while others just lose the current date and time after each shutdown.<br /> <p>Time & Date Errors<span> </span><br /> <p><span> </span><br /> <p>1. Turn on the computer. Look in the task bar at the bottom right. Make sure the date and time is set correctly. Double-click the time and click the up or down arrow to switch to the correct time. Click on the arrow next to month to change the month. Click "OK" when finished.<br /> <p><br /> <p>2. Turn off the computer. Wait 3 to 5 minutes and start the machine.<br /> <p><br /> <p>3. Look on the taskbar to see if time was lost and said a strange date January 1, 2000. Replace the CMOS battery, if this is the case.<br /> <p><br /> <p>CMOS Error Message<br /> <p>1. Look for error messages like "CMOS checksum error", "CMOS Read Error" or "CMOS battery failure" when you start your computer. These errors are caused in the machines shut down for several months or when the CMOS must be replaced.<br /> <p><br /> <p>2. Let the computer on for 24 hours. Restart the computer and find the error.<br /> <p><br /> <p>3. Change the CMOS as the return error.<br />

on Jun 21, 2011 | Computers & Internet

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CMOS Checksum error


Issue:
CMOS Checksum Bad or CMOS Date/Time Not Set


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Cause:
This issue is caused when the CMOS values are incorrect. This issue can occur because of any of the below possibilities.
* Bad or old CMOS battery.
* BIOS update.

Workaround 1:
1. Disconnecting power from computer without shutting down computer.
2. Attempt to reboot the computer. If error still occurs after rebooting the computer enter CMOS setup and check all values, this includes verifying the time and date are correct. Once everything has been verified and/or changed make sure you save and exit CMOS setup.
3. If you have a Phoenix BIOS and have an option for 'Reset Configuration Data', set this value to 'Yes' and save and exit the CMOS.
4. If the computer was had the power disconnected while it was still running it is possible this could cause the CMOS to become corrupt. Ensure that the computer is ready to be shut off before turning off the computer. If you have a laptop computer ensure that the battery is charged before disconnecting the power connection.
5. If the CMOS values have become corrupted entering the values in CMOS setup and saving and exiting CMOS should resolve your issues.
Note: If this issue continues to occur after you turn off your computer off it is possible that the CMOS battery may be failing or already bad. Before considering replacing the CMOS battery try leaving your computer on for several days.
Workaround 2:
If you performed workaround 1 and the error occurs again after a complete power down (i..e. removing the power cord), the CMOS battery is likely bad. Most systems use a small coin style lithium battery. These often last 3-6 years, but at some point run out of juice and need to be replaced. For desktops, your system manual or motherboard manual should specify the type of battery and location on the motherboard. For laptops, it is often very difficult to access and may require a professional to replace it. To replace the battery on a desktop system:
1. Turn off the system and remove the power plug.
2. Remove the case or side panel to access the motherboard.
3. Look for a round silver coin cell, typically in a black holder.


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4. Remove the battery while noting which way the battery is located. You may need a small flat screwdriver to release the side clip.
5. Install the replacement battery with the same battery type, being careful to insert it in the same direction as the removed battery (or using the polarity marked on the holder or manual).
6. Reassemble the case and power.
7. Turn on the power. You will get the CMOS Checksum Bad error once more, but it should be the last time. Go into the BIOS setup and set the date and time, and any other options you prefer.

on May 30, 2010 | Computers & Internet

1 Answer

Cmos battery error failure


The CMOS (BIOS) battery keeps the computer'a comfiguration and the Date & Time settings in the CMOS (BIOS) chip in its memory. When the CMOS (BIOS) battery is flat these configuration information is lost.
Replace the CMOS battery with a new one, in most cases this battery is a lithium 3 volt battery type CR2032 and it is coin size battery 18mm in dia.(check it to make sure the type of battery is installed on your motherboard).
When you replace this battery then go into the BIOS and set the Date & Time etc.

Jan 26, 2012 | Intel DG31PR Motherboard

2 Answers

UkI have a Vaio VGC-VA1 that needs a new cmos battery, how do I get at it? Mike M.


hi you can buy the CMOS battery from this link
CMOS battery are just the same regardless of brand

try also at ebay they have various CMOS battery see it here

If the holder of the cmos battery is not exactly the same of your original battery you can just remove the battery from the holder and use the holder of the original battery.thank you.

Aug 17, 2011 | Sony VAIO PCV-W20 PC Desktop

2 Answers

What.s the useful of cmos in this board


CMOS Battery powers the real-time clock and CMOS memory, which retains all the BIOS Settings including date.

CreativeTECH

May 04, 2011 | Compaq (203966-001) Motherboard

1 Answer

The battery charge light shows green, but the screen is black and no boot. How do I get to the CMOS battery? THANKS.


Hi cqs2000.

Do the following:

"To "Remove the CMOS battery form the computer!"

  • Shut-down the computer.

  • "Unplug the computer from the {Wall Out-let}.

  • Remove the Lithium battery from the "Notebook."

  • There is a compartment (underneath) the "Notebook that 'store' the CMOS battery."

  • "You will need a {very small Phillips screwdriver}.

  • paul7of9_182.jpg Remove the CMOS battery for: [30 minutes].

  • !Important: If you have to do it again?

  • Remove the CMOS battery for a {'longer amount of time'}.

paul7of9_181.jpg Replace the "CMOS battery."

  • Next, "Only plug-in the "Power Adapter" into the computer.

  • "Do not - replace the "Lithium battery!"

  • Once you have completed these 'task'.

  • "Restart the computer."

  • "Press the [F2] key, to 'enter' the CMOS / BIOS Setup!"

  • Next, 'reset' (all) "Values to the Default Settings."

  • "Press the [F10] key to 'Save' the changes!"

!Important: "Take a 'moment to rate the help', so I can get 'credit' for the work.

Thank you!" - paul7of9

Mar 15, 2011 | HP Pavilion xh485 Notebook

1 Answer

How can remove the cmos password


hi, if you know how to open a computer or laptop, just remove the cmos battery, it is a round shape silver battery just like the battery for wrist watch but its like 3 or 4 times bigger than the regular wrist watch battery,...just remove the cmos battery then boot up your computer then, after booting up, shutdown your computer then put back again the cmos battery, then boot up again your computer then you can go directly on your cmos, it will not prompt you for any password

regards

Dec 04, 2010 | Computers & Internet

1 Answer

My computer shows a message like this on the start : "this computer system #7WQ6V3J-595B, is protected by a password authentication system, since i bought this laptop in a "used sale fair" i dont know...


Hello,

the computer has been locked from the bios settings.

What you need to do now is to access the Cmos battery on the laptop, remove the Cmos battery and turn on the laptop without the Cmos battery.

The Cmos battery is where the laptop memorizes the password and stores it. So when the Cmos battery is absent, the computer cannot remember any password

The Cmos battery is like a watch battery, but its bigger than a watch battery. You can find the Cmos battery when you loose the laptop from under. But you must first remove the laptop battery before you loose the laptop. You can open the link below to see what a Cmos battery looks like:

http://images.google.com/images?hl=en&q=Cmos%20battery&aql=&oq=&um=1&ie=UTF-8&sa=N&tab=wi

You can also check the below link for more information about the bios.

http://www.technibble.com/how-to-bypass-or-remove-a-bios-password/

Take care.


Mar 01, 2010 | Office Equipment & Supplies

1 Answer

Cmos battery?


Computer CMOS information CMOS is an on-board semiconductor chip powered by a CMOS battery inside IBM compatible computers that stores information such as the system time
How to replace the CMOS battery. Information about why time may be lost or decreasing rapidly and how to replace your computer cmos battery



Computer Battery Help The first type of battery is the backup battery, which is commonly referred to as the "CMOS battery".

Good Luck, Please dont for get to Vote/Thank You

Dec 19, 2007 | HP Pavilion N3390 Notebook

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