Help with IBM L40SX Bios Battery

Older ThinkPads.. from the 600, the 7xx, the iSeries, 300, 500, the Transnote and, of course, the 701
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Tasurinchi
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Help with IBM L40SX Bios Battery

#1 Post by Tasurinchi » Fri Jan 18, 2013 4:06 pm

Could someone help me to find a backup battery for an old IBM L40SX?

The HMM lists the battery as part n° 79F0986, which cannot be found in Ebay or Google, does anybody know for an alternative? (like the BIOS batteries of more modern Thinkpads being "normal" CR2032 ones)

Thanks!
IBM Convertible 5140/L40SX/220/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E
A20p/A22p/A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T40x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/12*X2xx/4*X30x/Z60m/3*Z61x

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Re: Help with IBM L40SX Bios Battery

#2 Post by rkawakami » Fri Jan 18, 2013 4:33 pm

From the crude diagram in the Service Manual, it looks something like a CR123 battery. Those are typically used in cameras. Can you post a photo with dimensions?

edit: Are we talking about this system? http://hpholm.dk/L40SX.html

I found some resellers claiming to have this battery but they either don't list the price or have the wrong picture of the battery or want to charge over $200US for one! Based on the testing procedure in the HMM, the battery outputs 3V so that means you should be able to use any 3V lithium battery of the same physical size. Here's some examples:

http://www.panasonic.com/industrial/bat ... pe-br.aspx (BR series)
http://www.panasonic.com/industrial/bat ... eable.aspx (CR series)

The problem is that it looks like the original battery has leads attached to it. You'd have to find one with solder tabs and transfer the connector.

edit2: And finally, with the help of Google, this appears:

http://ps-2.kev009.com/ohlandl/8543/8543_Power.html

"PN 79F0986 Panasonic Lithium BR-2/3A 3V."
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
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Tasurinchi
Senior ThinkPadder
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Posts: 2009
Joined: Mon Aug 17, 2009 8:38 am
Location: Zurich, Switzerland

Re: Help with IBM L40SX Bios Battery

#3 Post by Tasurinchi » Fri Jan 18, 2013 5:27 pm

rkawakami wrote:edit: Are we talking about this system? http://hpholm.dk/L40SX.html
Yes!
rkawakami wrote:edit2: And finally, with the help of Google, this appears:

http://ps-2.kev009.com/ohlandl/8543/8543_Power.html

"PN 79F0986 Panasonic Lithium BR-2/3A 3V."
BIG BIG Thanks!! :bow:

(I've seen that picture in one of my google searches, but I wasn't sure if I should have trusted that image, it was faaar below in the search results)
IBM Convertible 5140/L40SX/220/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E
A20p/A22p/A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T40x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/12*X2xx/4*X30x/Z60m/3*Z61x

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