Question about IBM ThinkPad 380ED

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Replace batery how replace batery cr 1220 for ibm thinkpad 2635

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This battery is located in a slot on the motherboard. It's been a while since I've had a 380 apart, and I can't remember whether it's on the top or the bottom of the board. Start by removing the keyboard, if it's on the top, you will be able to see it. If it's on the bottom, then you will need to remove the motherboard in order to get to it.

Posted on Aug 20, 2008


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Instruction manual for IBM Type 2365 laptop cpm[uter

Jun 12, 2012 | IBM ThinkPad 380ED

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Tell me, please: IBM ThinkPad-2635 - where is the cmos battery and how will be disassembled 2635 to replace battery. Thanks!

The word please goes a LONG way with me. Makes me want to 'break my neck' to help that person;

991009, this is Lenovo Support > ThinkPad 380ED 2635 Notebook PC >
Manuals download page,

[ Note:

Manufacturer name: IBM
Model (Line): ThinkPad
Model Series: 380
Subseries: ED
Machine Type: 2635 ]

HMM stands for Hardware Maintenance Manual. It is a Service Manual.

Under the bold heading - User Guides and Manuals - click on -
Hardware maintenance manuals

In the drop down list, you want the first file listed.

Under the subheading -
Hardware maintenance manual Volume 4 ( September 1997) - ThinkPad 380, 385, 560/E, 760, 765,

click on the blue - [ + ] Click for files

Under the - Name - heading, click on the blue -

ThinkPad 380, 385, 560, 560E, all 760, 765, and SELECTADOCK III
Hardware Maintenance Manual (March 1999)

The service manual (HMM) is a PDF file.

[ Disregard the following if you are aware;

The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the above file name it may take up to 30 seconds, before the first page comes up.

[Took 10 seconds just now, with medium speed DSL connection ]

At the top of the PDF file in the header is the Zoom In icon, ( + ), and Zoom Out icon, ( - )

Zoom In increases the view size.
Zoom Out decreases the view size.

You can decrease to see the entire page, or increase, (And use the side/bottom bars), to view a particular subject on the page, Up Close.

To the Right of the Down Arrow is the page number box.
You can use the Down Arrow, (And later Up Arrow), to arrive at the page you want,


If you know the page you want you can do this;

1) Put your mouse cursor in the page number box. Left-click once,
(Anything in the page number box will now be highlighted in Blue ),

2) Type the page number,

3) Press the Enter key.

Page numbers in the PDF page number box, do NOT match the actual service manual page numbers.

Page numbers I refer to will be in the PDF page number box.
You can also click on the Bookmarks menu icon to the left, to arrive at the section you want.
[ It is right above the paperclip icon ]

You can save a copy to your computer. This way you can burn a copy to disk, or flashdrive, for safekeeping.

Then after checking out the copy is indeed good, you can delete it from the computer, and save harddrive space.
If you do not know how to do this procedure, and wish to, just state in a Comment ]

Go to Page 72.

[ Bookmarks menu;
1) Click on the + sign next to - ThinkPad 380, 385 (2635)

2) Click on the + sign next to - FRU Removals and Replacements

(FRU = Field Replaceable Units.
In otherwords for the tech in the field. If the tech cannot repair on site, the unit is sent to the manufacturer for repair, or replacement ]

3) Click right on - 1020 DIMM Card / Backup Battery

From me;
A) Remove ALL power. Remove the AC adapter (Charger) if plugged in, and remove the Battery.

B) Suggest lay a soft static free cloth on the table you're working on.
(NEVER work on a bed, couch, or directly on a carpet floor!
HIGH areas of Static electricity )

Turn the laptop over, bottom side up, Battery Compartment to the lower right. (Towards you)
Lay on the cloth.

Right above the Battery Compartment is the DIMM Card / Backup Battery Compartment.

Loosen it's single screw all the way. (It shouldn't remove )
Lift the cover up on the same side as the screw. There are plastic tabs on the opposite side.

The Backup Battery is to the left of the Ram Memory module/s.

(Note* The Positive { + } symbol on the battery ALWAYS goes UP, when being installed )

For additional questions please post in a Comment.


Apr 04, 2012 | IBM ThinkPad 380ED

1 Answer

How does one replace the button (bios) battery CR1220 on an IBM Thinkpad 2635-6AO

you will need to turn the laptop over and undo all the screws and remove the case to the laptop. this will allow you to get to the motherboard. once you get to the motherboard then you will be able to remove the battery. Be very careful

Jan 10, 2010 | IBM ThinkPad 380ED

1 Answer

Ibm 2635 thinkpad

You can get an adapter such as an DB9/com port to USB or LPT to USB adapter and you'll be able to connect a USB device or USB hub to your ThinkPad.

Feb 18, 2009 | IBM ThinkPad 380ED

1 Answer

Ibm thinkpad 2635 desplay drivers


here's the link for you to download the required driver, don forget to download the driver for Access IBM as well.

ThinkPad 380ED 26356AU

Dont forget to rate my solution. Thanks.

Jan 07, 2009 | IBM ThinkPad 380ED

1 Answer

IBM 2635-6AU

update bios ibm thinkpad type 2635

Oct 02, 2008 | IBM ThinkPad 380ED

1 Answer


Your problem sounds like the system isn't finding the hard disk

May 01, 2008 | IBM ThinkPad 380ED

1 Answer

IBM 2635

I just dug my old 2635 out from under the couch and having the same issue. I'm wondering if the internal battery needs replacing - this would give power to the system ROM where the date and time is held. I'll let you know if I find anything.

Mar 20, 2008 | IBM ThinkPad 380ED

2 Answers

Hi my IBM 2635-6AU, ThinkPad 380ED 26356AU screen is dark and i cant see

From what you are stating it seems like your backlight in your lcd needs to be replaced. Plug an external monitor up to your laptop. Press the fn & f key (the one with the picture of a monitor in it.) Your diplay should project to the monitor. Display is ok.....replace the backlight.

Hope this helps you

Oct 26, 2007 | IBM ThinkPad 380ED

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