Hi, all. In talking with some people about replacing Real Time / CMOS
batteries, I have had some ideas on "Improving" these.
Wanted to ask: Has anyone here soldered a Cordless Telephone battery
pack in place, to replace the standard 3V/60R NiCad battery pack?
(Disadvantage: It'd take "forever" to charge off the motherboard.
Advantage: It'd run your CMOS / Real Time Clock, for a LONG time.)
Just a semi-random thought, that I may try (Sometimes can get 3-AA NiCad
packs for $2 or so, this'd be interesting for some machines that are
normally powered off, though I may have to add a power charging circuit
to charge this quicker when the machine's powered on!) So many machines
here are usually off, only occasionally powered up for a few hours, and
that's rough on CMOS batteries. I've thought of putting a 117V to 5V
trickle charger in those machines.
I am imagining a quite slow voltage-limited, current-limited trickle
charge for these batteries (Probably just a diode from 5V then a 120 ohm
resistor to current limit this to about 6mA so a 60mAh pack charges at
1/10C or so?)
Has anyone reverse-engineered the charging circuit on a 386 or 486
motherboard? I'm getting more curious on this one <G>
Mark
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