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From: Jeff Wisnia
Subject: Re: Parallel Alkaline Batteries
Date: Wed, 02 Oct 2002 12:10:07 -0400
Organization: Posted via Supernews, http://www.supernews.com
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Sounds weird to me Paul.
AFAIK connecting two fresh identical alkaline cells in parallel
shouldn't discharge them.
Didja try the obvious? (Does the booster pack continue to put out 1.5
volts when there's only one battery in it - in either of the two
And, if you want to go to the bother, try putting a current meter in
series with each of the cells when the booster pack isn't in use and see
what, if any, the leakage current is. Though, I can't think of any
reason why there should be any designed in.
OTOH, if the booster pack plugs into the 3 volt DC input jack (You
didn't tell us that specifically.) then maybe it *is* supposed to put
out 3 volts and there's something wrong with it, like a bent battery
terminal contact shorting one cell right out whenever it's plugged in.
Probably the reason the DC input is set to accept 3 volts is because 1.5
volt wall wart transformer/rectifier DC supplies aren't that common,
most likely because the forward drops of inexpensive rectifiers are so
high and vary with temperature enough that it would be hard to keep the
output properly close to 1.5 vdc.
That's all the gas I can emit based on the info you supplied. I betcha
the right person in Sony could tell you what you want to know....Once
you locate him/her.
Paul Hovnanian wrote:
> I have a Sony Mini Disc player with an internal 1.5V NiMH battery
> plus a detachable 'booster pack' that takes 2 AA alkaline
> cells. Not paying much attention to it, I've been using the
> pack from time to time (when the internal battery gets low)
> but I've noticed that the alkalines don't seem to have much
> life in the pack even when its not in use. Maybe a month or
> I got poking around with the pack and noticed that its output
> is 1.5 volts with 2 fresh cells, not the 3 volts I expected to
> see on its output. The AA cells are connected in parallel.
> I'm guessing that the batteries probably aren't lasting
> long because one is discharging via a leakage current through
> the other.
> Has anyone seen this sort of battery configuration before?
> Why is it used? Is my guess about why the batteries don't
> last long correct?
> This setup is all the more strange because the player has an
> input for a 3Vdc wall wart power supply. This means that the
> player has power conditioning circuitry suitable to accept 3V.
> Paul Hovnanian mailto:Paul@Hovnanian.com
> send spam to: mailto:firstname.lastname@example.org
> Your mouse has moved. Windows must be restarted for
> the change to take effect. Reboot now? [OK]
Jeff Wisnia Brass Rat '57 ee W1BSV
"Liberalism is the art of looking for trouble, finding it, misdiagnosing
it and then misapplying the wrong remedies." (Adapted from Sir Ernest
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