--- 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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