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From: Terry King
Subject: Re: testing AA batteries?
Date: Tue, 10 Dec 2002 08:52:28 -0500
Organization: Mountain ClockWorks
X-Newsreader: MicroPlanet Gravity v2.30.1784
> >What is the voltage that is the dividing line between "good" and
> >"replace"......? This is for alkaline AA's only.
> Put 10 ohms across the cell and measure the voltage across it. The
> dividing line depends to some extent on what the cell is powering, but
> anything under 1 V on the above test is not worth keeping.
This is a good approach. I have a "Mallory Professional Battery
Tester" (Circa 1968) that I have used for years with good results.
It has an arbitrary scale marked REPLACE|WEAK|GOOD
I test a lot of AA alkalines these days too. What the Mallory does:
"Heavy Drain" switch, on 1.5V range: Load resistance 2.5 ohms
New AA Alkalines read: 1.35V which is on the second "O" in GOOD
Using test supply : 1.00V reads bottom of GOOD (top edge of WEAK)
Using test supply : 0.85V reads bottom of WEAK
I bet the "10 ohms 1.0V" test is about equal to bottom of GOOD on the
Regards, Terry King ...In The Woods In Vermont
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