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701CS - CR2032 (non rechargable) - safe to use?

Older ThinkPads.. from the 600, the 7xx, the iSeries, 300, 500, the Transnote and, of course, the 701
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701CS - CR2032 (non rechargable) - safe to use?

#1 Post by A_random_doood » Wed Sep 30, 2020 11:08 am

I saw on a few blogs that people use CR2032 or a smaller one as a CMOS replacement battery.

However, as far as I know and I read in this post: viewtopic.php?t=126703, the 701C / CS will try recharging it?

So how are the people using CR2032 then?

Also the diode solution works, but all diodes have a voltage drop. I could use a germanium diode with a 0.2V drop, but then its gonna be providing 2.8V to the board instead of 3V.

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Re: 701CS - CR2032 (non rechargable) - safe to use?

#2 Post by Thinkpad4by3 » Wed Sep 30, 2020 2:26 pm

0.2V is idealistically high, assume 0.5 minimum, closer to 0.7.

Use 3x 1.5 LR44 and a 0.7v silicon diode.
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