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Rebuild 701C battery - no percentage

Older ThinkPads.. from the 600, the 7xx, the iSeries, 300, 500, the Transnote and, of course, the 701
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TheForgottenKing
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Rebuild 701C battery - no percentage

#1 Post by TheForgottenKing » Mon Sep 17, 2018 8:11 pm

Rebuilt the 701C's battery using 2500mah nimh cells

Clearly the battery is charged as I can unplug the ac adapter and it runs off the battery, but it always reports 0%

Any ideas?

Thinkpad4by3
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Re: Rebuild 701C battery - no percentage

#2 Post by Thinkpad4by3 » Mon Sep 17, 2018 8:32 pm

Probably something to do with the tiny chip on the 701C's battery.

http://www.conradshome.com/thinkpad/701 ... sion_2.png
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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.

TheForgottenKing
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Re: Rebuild 701C battery - no percentage

#3 Post by TheForgottenKing » Mon Sep 17, 2018 8:47 pm

Figured that would be it, might have to check connection

tdot
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Re: Rebuild 701C battery - no percentage

#4 Post by tdot » Mon Sep 17, 2018 11:17 pm

TheForgottenKing wrote:
Mon Sep 17, 2018 8:11 pm
Rebuilt the 701C's battery using 2500mah nimh cells

Clearly the battery is charged as I can unplug the ac adapter and it runs off the battery, but it always reports 0%

Any ideas?
Yes actually. I had the exact same thing when I rebuilt my 701C battery.

Well, first check in the BIOS that it reports the battery status as 'good'. I actually had two batteries to rebuild, but one of the 'tiny chips' seemed to report BAD status to the 701C, so I used the other one instead.

Then what I did, after checking everything and getting angry about it for a while (and finally realizing that if they ARE reporting their status, that means they are in fact communicating with the 701), was let it die, then fully charge it, then let it die. Finally, a % started showing up. Not sure if this will work for you, but it seemed to work for me ...

TheForgottenKing
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Re: Rebuild 701C battery - no percentage

#5 Post by TheForgottenKing » Tue Sep 18, 2018 9:00 am

The chip broke off mine, probably why, I will solder my other one on, hopefully it isn't as corroded

Thinkpad4by3
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Re: Rebuild 701C battery - no percentage

#6 Post by Thinkpad4by3 » Tue Sep 18, 2018 11:14 am

Id recommend tossing the original board and getting one from a place like oshpark. How expensive could a simple 3-4 component board be to create and get?
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.

TheForgottenKing
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Posts: 123
Joined: Fri Apr 13, 2018 11:41 am
Location: Chicago, IL

Re: Rebuild 701C battery - no percentage

#7 Post by TheForgottenKing » Tue Sep 18, 2018 5:06 pm

Update: replaced the chip and 701C says battery is not installed which is hilarious as it is running off the battery. I am going to try to find an OEM chip and failing that reprogram another DS2434

TheForgottenKing
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Re: Rebuild 701C battery - no percentage

#8 Post by TheForgottenKing » Tue Sep 18, 2018 9:56 pm

Update again: Now it says "bad battery"

Thinkpad4by3
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Re: Rebuild 701C battery - no percentage

#9 Post by Thinkpad4by3 » Tue Sep 18, 2018 9:58 pm

I should make my own 701C battery that uses slots for the energizer cells so that they can externally charged.
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.

TheForgottenKing
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Posts: 123
Joined: Fri Apr 13, 2018 11:41 am
Location: Chicago, IL

Re: Rebuild 701C battery - no percentage

#10 Post by TheForgottenKing » Wed Sep 19, 2018 7:43 am

That's what I may do in the event that I can't get the percentage working

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