Samuel W. Heywood wrote:
> On Sun, 10 Sep 2000 23:34:27 -0700 Mark Willis <[EMAIL PROTECTED]> wrote:
> > Samuel W. Heywood wrote:
> >> On Tue, 29 Aug 2000 03:00:29 -0700 Mark Willis <[EMAIL PROTECTED]> wrote:
> > Scary numbers: With 6mA charging a 360mAh NiCad pack, it'd take about
> > 60 hours for a full charge. Probably longer, all things considered.
> > <G>
>
> That is correct for a 360 mAh battery pack.
>
> My calculation is for a 60mAh NiCad pack, as originally stated, not a
> 360mAh NiCad pack. Only 10 hours for a 60 mAh battery pack.
Whole idea's to solve MY (and others') problems with some computers
here, I thought? <G>
> I was making the calculation for the simple installation of a
> current-limiting resistor connected between the 5V source and the 3.6 V
> NiCad pack. I don't see the need for the diode if you simply disconnect
> your 5V source after your 3.6 V NiCad pack is fully charged. IMHO, a NiCad
> pack should be charged, then discharged almost completely, and then charged
> again. I don't think it is a good idea to keep a NiCad pack on continuous
> trickle charge all the time.
I don't plan to leave the computer on for 60+ hours, then open the case
and remove the jumper for 5V power, when a diode'll do the same thing
(5V power supply drops to 0V, battery drains at 30mA or so i.e. 12 hours
to DEAD, then have to charge for another 60+ hours again and re-enter
all the CMOS values? I need the NiCad pack to LAST for a few months
between times I need these rarely-used computers working; the last
thing I need's more work! <G>
Trickle charge on NiCad's is not a problem, read the battery FAQs. Far
worse to HARD charge a NiCad continuously; Slow charging at c/10 isn't
bad at all, at under c/10 would happen in my design <G>
> > (For those not knowing: The diode's pretty mandatory, it's so you don't
> > discharge the battery to all the 5V powered stuff when the power supply
> > on your computer's turned off! That'd be "bad". <G>)
>
> I agree; however, in my circuit I would simply disconnect the 5V powered
> stuff when the computer is powered off. Then no problem.
I have perhaps more computers than you do, and lots more work, I guess
<G> A 5 cent diode's pretty darn cheap IMO if it reduces my
workload... $8 Replacement NiCad packs are similarly pretty inexpensive
if they save me an hour or two of work over their lifetime.
> All the best,
>
> Sam Heywood
Mark
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