Question about IBM ThinkPad 390x Notebook

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BIOS/RTC/CMOS backup battery

Hi,Does anyone know where l can buy a cmos backup battery other than ibm please as the postage is 2 times more than the cost of it!!! regards

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  • jimpl Aug 20, 2007

    Hi informatica, I`m in england and the part number l got from ibm is -: 11J8591 l think it`s a little round battery which l`ve been told again by ibm is located under the modem bay.
    hope this helps
    kind regards



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Please tell us the type / part number of the battery and where you are located. It's a big world out there!

Posted on Aug 20, 2007

  • Greg Cann
    Greg Cann Aug 21, 2007

    My research suggests that the battery is a lithium type CR1220:

    I suggest you remove the one you have & take off the plastic cover & confirm.

    If that is the case then take a trip to your local camera shop or Maplin and pay no more than £1.99!

    Bear in mind that this will be the bare cell & you may have to attach wires to it? Don't know as I haven't taken that PC apart. If you do need to solder to it be aware that these cells can explode if overheated! If in doubt then this was the best "official" replacement I could find:

    Please update the question & let us know if the information given was useful to you - Good Luck!



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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

Laptop not used for some years. could enter bios OK to reset Replaced U/S CMOS battery with no problem. Restarted............ Message press F1 ibm bios setup press F11 to invoke IBM product recovery...

I received an IBM laptop with same issue a few months back. The error message due to the drained out CMOS RTC (coin-cell battery), which retains and other BIOS settings.
The system is OK and all you have to do is to get the CMOS/RTC battery replaced by the a professional.
Good Luck!

Dec 31, 2010 | IBM ThinkPad R30 2656 Notebook

1 Answer

Error 00161 00163

I do not think you fixed the CMOS battery - (backup battery = CMOS battery)
According to the error codes, you have a dead backup battery and the time is not set. Makes sense?
(Dead battery.) 1. Go to Checking the Backup Battery
2. Backup battery.
3. System board.
(Time and date were not set.) 1. Set time and date.
2. System board.

Go to Find and download the user manual, and the "hardware maintenance manual."
Do you know how to get into bios/setup?

Start with the machine OFF. HOLD DOWN and CONTINUE TO HOLD THE "F1" key.
WHILE STILL HOLDING "F1", turn the power on, and CONTINUE TO HOLD "F1"
This will get you into the bios "setup." You should check the date, bootup order, etc, and reset.
I would check the "wire" you think you reconnected---you may just not have actually reconnected it.
The "hardware maintenance manual" shows you how to maintain this machine, and it explains the meaning of the error codes.

This will get you started on looking for the manual:

May 16, 2010 | IBM ThinkPad 380ED

1 Answer

I have 0271 error can get into bios but not able to change the date and time??


The error means that you have to change the BIOS battery first before trying to change the date and time.
As far as i know with IBM's the CMOS (RTC) battery is located under one of the panels underneath the laptop and is usually covered with red, blue or yellow plastic with wires coming from it. Disconnect the battery and replace it

Once the CMOS battery is replaced you can set the date and time and no more error messages.


Jan 24, 2010 | IBM ThinkPad T60 Notebook

1 Answer

**** RTC battery is low or CMOS checksum is inconsistent **** Press [F1] to set Date/Time


Please reset cmos to factory defaults.
Then enter the bios setup and configure it and save changes.

Apr 20, 2009 | Computers & Internet

1 Answer

Chassis intruded!!


This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords.
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5-10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to reenter data.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default position. Removing the cap will cause system boot failure!If the steps above do not help, remove the onboard battery and move the jumper again to clear the CMOS RTC RAM data. After clearing the CMDS, reinstall the battery.

You do not need to clear the RTC when the system hangs due to overclocking. For system failure due to overclocking, use the CPU Parameter Recall (C.P.R) feature. Shut down and reboot the system so the BIOS can automatically reset parameter settings to default values

Mar 18, 2009 | ASUS P5V800-MX Motherboard

2 Answers

Starting ibm 600e

Hi there.
Errors 161, 192, 163.
All three of these errors are connected to the back up battery.
To resolve this problem:
1. open memory flap on base of laptop (small philips screwdriver required)
2. find the small connector with 1 black & 1 red wire coming from it.
3. disconnect above connector and gently pull the Red&black wires. The backup battery should just pull out from under the casing.
4. get replacement battery. Either
a. call IBM spares (07900 247 490 in UK) and ask for FRU:
02K6502. UK price is about £8 + £15 delivery + VAT.
b. if comfortable with soldering iron: Carefully open the packaging on the backup battery using a sharp knife.
Remove the solder tags from the battery (these are spot welded so need to be cut/broken off). Buy a new CR2025 battery from any computer shop, jeweler, or camera shop.
Using electrical tape, insulate all round edge of battery
Solder the leads onto the new battery - note polarity. Red wire to +, black wire to -.
Using more insulating tape, wrap battery so that all exposed metal is covered.
5. put new battery into laptop (reverse steps 1-3)
6. start up computer, error 192 has gone, but still shows 161, 163. Select OK.
7. reset date & time, and OK
8. when screen shows 'O / I' restart laptop using on/off switch at side.

Good luck and thanks for using FixYa!!

Mar 05, 2009 | IBM ThinkPad T21 Notebook

1 Answer

HP nc6320 BIOS Power on Password

You Have to Remove RTC battery ( Cmos ) battery.
Wait approximately 5 minutes
Replace the RTC battery and reassemble the computer
Connect Ac Power to the computer. Do not reinsert any batteries at this time
Turn On the computer

all the passwords and all the cmos setting have be cleared.

Aug 12, 2008 | HP Compaq nc6320 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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