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How do I gain access to the CMOS (RTC) battery to replace it?

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  • Vern Haynes
    Vern Haynes Dec 31, 2010

    what type (make, model ) of laptop are we talking about?

  • Elaine Albertson
    Elaine Albertson Dec 31, 2010

    What make/model of laptop?

  • graeme ian hunter Dec 31, 2010

    Which model, they all ahve different access points



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Depending on the laptop, it is most likely located on the motherboard, a major dis-assembly job.

Posted on Dec 31, 2010


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First you need to remove the keyboard to gain access to the CMOS battery (Acer call them a RTC battery)
Tell you what give me a email address and I'll send you the service manual.


Jan 08, 2008 | Acer Extensa 503T Notebook

1 Answer

Remove bios password

Web address for the handbook:
If the notebook you are servicing has an unknown password, follow these steps to clear the password. These steps also clear CMOS:1. Prepare the notebook for disassembly (refer to Section 4.3, "Miscellaneous Plastics/ Hardware Kit," for more information).2. Remove the real-time clock (RTC) battery (refer toSection 6.24, "RTC Battery," for more information on removing and replacing the RTC battery).3. Wait approximately 5 minutes.4. Replace the RTC battery and reassemble the notebook.5. Connect AC power to the notebook. Do not reinsert any battery packs at this time.6. Turn on the notebook.All passwords and all CMOS settings have been cleared

Mar 03, 2013 | HP Compaq nc4200 Notebook

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I have laptop sony vgn-n530e i gave bios password but i forgate the password what showd i do

Hi Abid


The only way to solve this problem is to remember and enter the correct password.

On some laptops, it is possible to delete the BIOS Memory by temporarily disconnecting the CMOS/RTC Battery before reconnecting it and reassembling the laptop.

So no damage is done during disassembly and the correct component positions and cable connections are restored during reassembly, this is a job best done by an experienced repair technician.

See below for the location of a CMOS Battery in a typical laptop. The CMOS battery is the rounded, yellow, flattish object at the front centre of the image. While yellow is a common colour, the CMOS/RTC Battery can also be encased in blue, brown, black or green plastic.

On some models the CMOS/RTC Battery is accessible without disassembly, via the Wireless Card compartment underneath the laptop.

On other models, disconnecting and reconnecting the CMOS/RTC Battery is ineffective because nearby capacitors store the data if the Battery is removed and two contact points on the motherboard have to be bridged to dissipate the charge from the capacitors.

The Service/Disassembly Manual for your series of laptops can be downloaded in PDF format from here:

In this model, the rounded, flattish light blue object near the Wireless Card is likely to be the CMOS/RTC Battery.

I hope this helps.

If this Answer goes some way towards helping to resolve your Query, Problem or Fault, please take the time to Rate it. Doing so helps Solution Providers, like me, better understand the needs and the point of view of Askers, like you, and guides us in exploring the best ways to provide the most comprehensive, useful and high quality Responses and Solutions we can. If you need further help, please do not hesitate to post another Question or add a Comment to this Question.

Thanks for using FixYa.

Sep 25, 2011 | Computers & Internet

1 Answer

I need to rest password in bios

Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS settings to be cleared. BIOS password can be removed by temporarily disconnecting/ removing the RTC/ CMOS (Coin-cell) battery from the motherboard.
Disconnect the coin-cell battery from the system board and it will reset the BIOS to its default setting and the password would be gone.
Please Refer to Page 29, 106 & 79 of the REPAIR MANUAL IBM T40 for Battery removal, keyboard removal and RTC battery removal instructions.
The Backup Battery (RTC, CMOS) is located under the keyboard. So you have to remove the keyboard to access the battery. The above Manual from IBM shows the exact method/ instructions and pictures for laptop dis-assembly for the purpose.
If you are comfortable with working inside such electronics, you can't do it yourself, or else you may seek help from local laptop service professional.

Hope it helps! Good Luck! Thanks for using Fixya!

Jun 21, 2011 | IBM ThinkPad T40 2373 Notebook

1 Answer

Location of RTC battery

The CMOS battery is on the back-side of the motherboard on the nx9030. You'll have to lift the motherboard up to gain access to it.

Aug 25, 2008 | HP Compaq nx9030 Notebook

2 Answers

Cmos battery

You'll need to gain access to the top of the mainboard, here's a good guide: In case you don't know, the cmos battery is a round, flat silver object, coin-like. Good luck!

Apr 18, 2007 | Toshiba Satellite M45-S265 Notebook

2 Answers

CMOS or RTC battery for this laptop : can it be replaced

Hi AshishB, Yes, Toshiba does refer to the CMOS battery in their literature as the real time clock battery. Your retailer is half right, the battery is on the motherboard but its attached via a connector and it can be replaced. Here are links to a couple of venders that sell the RTC battery for your laptop: - Http://,Satellite,L15-S104,Laptop,Batteries-Backup-RTC.aspx - Let us know if you have any other questions and please don?t forget to rate the posting.

Jan 18, 2007 | Toshiba Satellite L15-S104 Notebook

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