Retro PC Part 8: Making our own CMOS battery

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Germany root42
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Published on ● Video Link: https://www.youtube.com/watch?v=seCoC2AcHqs


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Since my 286 mainboard is missing its NiCd rechargeable CMOS battery, we need to make a new one. I do not want any replacement on the board which is NiCd and may leak again. So I opted to buy a 3.6V Lithium battery that should hold for years, and which can be coupled with a diode to prevent it from being charged by the motherboard. The 1N4148 diode has a low forward voltage, which helps in maintaining a relatively high voltage of about 3.4V for the CMOS.

The battery I chose has metal strips for soldering attached and is probably absolute overkill with 2450 mAh. But I guess at a few microamps it will last a very long time...

The battery: https://www.ebay.de/itm/Lithium-Batterie-LR6-AA-3-6V-Volt-Saft-LS14500-14500-mit-Lötfahne/201772622096

The Diode: https://en.wikipedia.org/wiki/1N4148_signal_diode



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Tags:
diy
retro-gaming
retro-pc
soldering
cmos-battery