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From: Paul Hovnanian
Subject: Parallel Alkaline Batteries
Date: Tue, 01 Oct 2002 21:01:17 -0700
Organization: Software Conflagration Control
X-Mailer: Mozilla 4.72 [en] (X11; U; Linux 2.2.14-5.0 i586)
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
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
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