How you can substitute the CMOS battery

Up to date: 06/30/2020 by Pc Hope

You are reading: How to take out cmos battery | How you can substitute the CMOS battery

There are a number of causes the CMOS battery must be changed in your laptop. This web page supplies data on why you would want a alternative, and the steps to repair it.

Why do I would like to switch my CMOS battery?

  • Pc is shedding its time or date settings.
  • An error or alert message, like the next, is displayed when the pc boots.
  • CMOS Learn Error
  • CMOS Checksum Error
  • CMOS Battery Failure
  • System battery voltage is low

If any of the problems or messages above are encountered, you probably want to switch the CMOS battery. The method to switch it’s detailed within the following sections.

Find your CMOS battery


When inside your laptop, ensure you are conscious of ESD and its risks.

Open the pc case and discover the battery on the motherboard. Confirm it’s accessible and will be eliminated. Right this moment, most computer systems use a coin cell CMOS battery, just like the CR2032 battery proven within the image.

  • How do I open my laptop case?


Some CMOS batteries could also be held down by a steel clip or bar. The battery will be eliminated by sliding it out from beneath the clip. Don’t bend this clip to get the battery out, as a bent clip can lead to the brand new battery not staying within the socket.

In the event you can not find the CMOS battery, seek advice from the motherboard documentation or contact the pc producer. In the event you now not have the documentation for the motherboard, it is probably yow will discover it on-line.


With some computer systems, it’s possible you’ll must disconnect cables, take away drives, or take away different components of the pc to get full entry to the CMOS battery.

Acquire battery data

Sadly, most producers don’t checklist the precise sort and mannequin of the CMOS battery. After you have situated the battery, we advocate you write down its specs (voltage, chemistry, wiring). If attainable, take away the battery and take it to a retail location.


  • Extra shopping for data is on our battery shopping for suggestions web page.


For many computer systems, the mannequin of the battery is CR2032.

Eradicating the battery

In case your laptop makes use of a coin cell battery, eradicating the battery is comparatively easy. Use your fingers to seize the sting of the battery and pull it up and out of the socket holding it in place. Some motherboards have a clip holding the battery down. In case your laptop’s motherboard has this clip, it’s possible you’ll want to make use of one hand to maneuver the clip up and the opposite hand to drag the battery out.


When inside your laptop, ensure you are conscious of ESD and all its potential risks.

Sadly, not all CMOS batteries are detachable. Some producers solely enable a alternative battery to be added. In case your laptop doesn’t have a coin cell battery, seek advice from your documentation or contact your laptop producer for additional help.

In case your laptop’s motherboard doesn’t have a detachable battery, you have to set a jumper on the motherboard to put in the brand new battery.

Insert the brand new battery

After buying a brand new battery, take away the previous battery and substitute it with the brand new battery. Some computer systems might not have a detachable battery, for these computer systems insert the brand new battery into the secondary battery socket on the motherboard.

Enter CMOS values

As soon as the battery has been changed, activate the pc and reset the CMOS values to the defaults. After the values have all been entered, be sure that to avoid wasting the settings earlier than exiting. Many CMOS setups let you press a key, equivalent to F10, to avoid wasting values and exit with one motion.

  • How you can reset CMOS or BIOS settings.

Unhealthy {hardware}

In the event you proceed to obtain the error after following all of the steps above, this can be a signal of a extra critical concern. The probably causes are a nasty energy provide or unhealthy motherboard. It’s possible you’ll must look into changing the ability provide or the motherboard to resolve the difficulty. At this level, we’d advocate taking your laptop to a pc restore store to have them diagnose the difficulty.

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