Re: [lro] Batteries...

From: Alan J. Richer (mrchurchill109@yahoo.com)
Date: Thu Jan 23 2003 - 17:40:38 EST

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    --- Bryan Hoult <bhoult@peoplepc.com> wrote:
    >
    > On Thu, 23 Jan 2003, "Tom Proctor" wrote:
    >
    > load test
    > one?
    >
    > Jumper cables, a wet sponge, and a jeeper.

    Not ONE - you need TWO wet sponges...geeze! Didn't you
    learn ANYTHING in electrickery class?

    8*)

    Seriously, as far as load-testing a battery goes, you
    really do need fairly sophisticated equipment (a load cell
    and meters) to do so.

    As an example, my ancient and venerable commercial battery
    charger has a test feature built into it. This test feature
    puts the battery across a heavy grate of metal with a fan
    blowing across it - think MONGO-ampere resistor.

    This is connected for a fixed time, then the voltage is
    read.

    To be honest, i never use it. Typically I look at the gross
    float voltage. If a battery taken off charge and allowed
    to sit for a short while doesn't manage to stabilize at 12
    and a half or better, then it's likely sulphated.

    If you meter a battery and it's less than 11.5 volts or so
    after an attempt to charge, you likely have a dead cell.

    Pardon the typos folks - hands are VERY stiff today from
    the cold weather. -ajr

    =====
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