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X6x CMOS battery wiring

X60/X61 series specific matters only.
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dandreye
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X6x CMOS battery wiring

#1 Post by dandreye » Sat Dec 08, 2018 9:01 am

Hi All,

Could anyone please explain what the "extra" (3rd) wire in X6x CMOS battery is for? Assuming it's a CR2032 (3V) cell inside I'm tempted to make my own because of their ridiculous pricing (>4 times more than what T4x batteries sell for).

Thanks in advance!
X1C7 20KG-S3Y80N, X1C1 3460-1F4, 2x X61s 7667-34G, X61s 7667-Y24, X61s 7667-WQ8, X61s 7666-AA5, X61s 7666-34G, X60s 1702-W96, T43 2669-YJ6, T42 2373-Q91

axur-delmeria
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Re: X6x CMOS battery wiring

#2 Post by axur-delmeria » Sat Dec 08, 2018 11:30 am

dandreye wrote:
Sat Dec 08, 2018 9:01 am
Hi All,

Could anyone please explain what the "extra" (3rd) wire in X6x CMOS battery is for? Assuming it's a CR2032 (3V) cell inside I'm tempted to make my own because of their ridiculous pricing (>4 times more than what T4x batteries sell for).

Thanks in advance!
Can't remember if it's wired to the positive or negative of the CMOS battery.
Daily driver: X220 4291-C91 i7-2620M

Backup: X220 4291-P79 i5-2520M
Toy: X60F Core Solo U1300
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

RealBlackStuff
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Re: X6x CMOS battery wiring

#3 Post by RealBlackStuff » Sat Dec 08, 2018 12:10 pm

Cut open the yellow plastic around the cell, so you can see where the wires go.
Be careful not to short it.
A piece of tape will fix it again.

My guess: RED to PLUS
Both BLACK and WHITE to GROUND
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!

dandreye
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Re: X6x CMOS battery wiring

#4 Post by dandreye » Mon Dec 10, 2018 9:10 am

axur-delmeria:
RealBlackStuff:

Thanks for your replies. So it's there not to carry some sort of signalling as one might think. Looks like the "extra" (white) wire is always coupled with black wire attached to battery's "-":
https://electronics.stackexchange.com/q ... in-battery
https://forum.lowyat.net/topic/3044913/all
http://dragonfix.es/2013/11/11/make-you ... c-battery/

Will try making my own then.
X1C7 20KG-S3Y80N, X1C1 3460-1F4, 2x X61s 7667-34G, X61s 7667-Y24, X61s 7667-WQ8, X61s 7666-AA5, X61s 7666-34G, X60s 1702-W96, T43 2669-YJ6, T42 2373-Q91

Thinkpad4by3
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Re: X6x CMOS battery wiring

#5 Post by Thinkpad4by3 » Mon Dec 10, 2018 9:13 am

The best I can think of is a thermistor...but that doesn't make any sense. IBM/Lenovo hasn't used rechargable cells AFAIK since the 755 or 760 series.

On the very off chance it is....red would be positive, white would be one side of the thermistor, and black would be the other side of the thermistor and ground.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

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Re: X6x CMOS battery wiring

#6 Post by RealBlackStuff » Mon Dec 10, 2018 9:53 am

dandreye wrote:
Mon Dec 10, 2018 9:10 am
Will try making my own then.
Get a new CMOS from a nearby pharmacy.
Take the plastic off the old CMOS.
Carefully tear the flat connector-strips from the battery (from the outside toward the middle, using pliers).
Straighten the old strips as best you can.
Put the black/white strip on the new battery's ground and the red strip on the plus side.
Make sure they cannot connect to each other!
Tightly put some electricians tape or scotch tape around it.
You're done.

Thinkpad4by3
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Re: X6x CMOS battery wiring

#7 Post by Thinkpad4by3 » Mon Dec 10, 2018 10:00 am

RealBlackStuff wrote:
Mon Dec 10, 2018 9:53 am
Make sure they cannot connect to each other!
Tightly put some electricians tape or scotch tape around it.
You're done.
If it were me I'd pickup some large diameter heat shrink tubing and use that. It won't come loose in a few years like electrical tape or Scotch tape. Also more "rugged". I know I can get some at my local electronics shop for next to nothing.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

dandreye
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Re: X6x CMOS battery wiring

#8 Post by dandreye » Mon Dec 10, 2018 1:23 pm

I was actually thinking of using both: electrician's tape first to keep those strips in place and heat shrink tubing atop to reinforce the attachment.

Thanks All )
X1C7 20KG-S3Y80N, X1C1 3460-1F4, 2x X61s 7667-34G, X61s 7667-Y24, X61s 7667-WQ8, X61s 7666-AA5, X61s 7666-34G, X60s 1702-W96, T43 2669-YJ6, T42 2373-Q91

axur-delmeria
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Re: X6x CMOS battery wiring

#9 Post by axur-delmeria » Mon Dec 10, 2018 1:54 pm

dandreye wrote:
Mon Dec 10, 2018 1:23 pm
I was actually thinking of using both: electrician's tape first to keep those strips in place and heat shrink tubing atop to reinforce the attachment.

Thanks All )
You can also try this method: https://youtu.be/lWQiQ8VF7uo
Daily driver: X220 4291-C91 i7-2620M

Backup: X220 4291-P79 i5-2520M
Toy: X60F Core Solo U1300
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

tom lightbody
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Re: X6x CMOS battery wiring

#10 Post by tom lightbody » Mon Dec 10, 2018 5:42 pm

good discussion. Two additional ideas:
1. if the yellow plastic is removed carefully, it can be replaced
perhaps with a bit of tape
2. soldering is OK, with a bit of flux on the battery, and a very
hot iron.
the way up and the way down are the same (heraclitus)

dandreye
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Re: X6x CMOS battery wiring

#11 Post by dandreye » Mon Dec 10, 2018 7:01 pm

axur-delmeria:

> You can also try this method: https://youtu.be/lWQiQ8VF7uo

Looks good too, thanks ) Probably best to start with putting some insulation along battery edge to avoid shorting its poles. In fact the best solution would probably be using one of those battery sockets but there's barely any space on the mobo to glue it to... unless really long wires can be used.

tom lightbody:

> soldering is OK, with a bit of flux on the battery, and a very hot iron.

I'd love to try it but I've never been particularly good with irons, so not even sure if I should ) Btw looks like some cells come with weld-on tabs although they cost more.
X1C7 20KG-S3Y80N, X1C1 3460-1F4, 2x X61s 7667-34G, X61s 7667-Y24, X61s 7667-WQ8, X61s 7666-AA5, X61s 7666-34G, X60s 1702-W96, T43 2669-YJ6, T42 2373-Q91

Thinkpad4by3
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Re: X6x CMOS battery wiring

#12 Post by Thinkpad4by3 » Mon Dec 10, 2018 7:41 pm

If you aren't good with a soldering iron getting prewelded tabs for soldering is a VERY GOOD IDEA! Trust me...exploding batteries is no fun, especially when wielding a 700 degree iron.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

madicetea
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Re: X6x CMOS battery wiring

#13 Post by madicetea » Wed Dec 19, 2018 6:02 am

dandreye wrote:
Sat Dec 08, 2018 9:01 am
Hi All,

Could anyone please explain what the "extra" (3rd) wire in X6x CMOS battery is for? Assuming it's a CR2032 (3V) cell inside I'm tempted to make my own because of their ridiculous pricing (>4 times more than what T4x batteries sell for).

Thanks in advance!
Wait, how much do they go for in the UK? They aren't even 8usd worth (~900 yen) here in Japan?

-madicetea, 2002 19 December 2018
Greetings from Tokyo,
MadIceTea
, IBM Thinkpad Enthusiast

Daily Driver Thinkpads: X250 16gb 3TB FHD, X61 T9300 SXGA+, x2001 AFFS i5-530
Occasional Use: PC110 20MB
Past: 701Cs German, 535/X, 760E/XL, i-series 12/14xx, piano s30, R60e, X60, X61, T60, T61, X200 P8700, X121e

madicetea
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Re: X6x CMOS battery wiring

#14 Post by madicetea » Wed Dec 19, 2018 6:04 am

Thinkpad4by3 wrote:
Mon Dec 10, 2018 7:41 pm
If you aren't good with a soldering iron getting prewelded tabs for soldering is a VERY GOOD IDEA! Trust me...exploding batteries is no fun, especially when wielding a 700 degree iron.
Oh yeah, reminds me of the time I did a mock solder with a regular fire torch and gave a couple fingers a few skin layers deep of a burn at 200c or so. I think I attempted this with an old 760 cell. No fun at all.

I can only imagine the pain of a 700c explosion (and don't forget goggles for anything that explodes - I like being able to see / not being blind).

-madicetea, 2004 on 19 Dec 2018
Greetings from Tokyo,
MadIceTea
, IBM Thinkpad Enthusiast

Daily Driver Thinkpads: X250 16gb 3TB FHD, X61 T9300 SXGA+, x2001 AFFS i5-530
Occasional Use: PC110 20MB
Past: 701Cs German, 535/X, 760E/XL, i-series 12/14xx, piano s30, R60e, X60, X61, T60, T61, X200 P8700, X121e

RealBlackStuff
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Re: X6x CMOS battery wiring

#15 Post by RealBlackStuff » Wed Dec 19, 2018 7:48 am

DO NOT SOLDER A CMOS BATTERY UNDER ANY CIRCUMSTANCE!
You're asking for trouble!

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