Testing Nicad/nicd or NiMH cell ESR or SLA Gel Cell Battery Internal Resistance

Yep, Phil, your conclusions as to the points I'd been referring to are correct.

In particular, I meant to mention the comparitive testing issue, but forgot.

Much of my workbench testing is comparative anyway, and it's not as though rechargeable cells are marked with their IR specification.

I decided to try a cheap cell/battery IR tester and may expand to some sort of controlled discharge-type analyzer later.

Or, item 290345697222

-- Cheers, WB .............

Thanks for posting your experience with the Blue ESR Meter, Fred.

Keeping notes on various measurements has been a regular habit of mine almost any time I'm testing or evaluating.

I think I know whatcha mean Fred, about not being sure exactly what the readings indicate. There sure won't be any numbers on a new battery regarding what the internal resistance should be.

For decades, all I ever heard about any lead/acid battery's state-of-charge, was specific gravity readings from a hygrometer.

Then a few years ago, I noticed an off-grid guy talking about the internal resistance of LA batteries being a significant indication of the general condition, or the amount of useable capacity remaining in used batteries he was scrounging. His remarks and others who also depend upon battery power because they're off-grid, gave me the impression that they were seriously interested in being able to gage and monitor their batteries.

The other point of his website was concerned with desulphator circuits he had built to recover servicable life from used heavy duty commercial batteries he could get for free.

So, as I did more looking for info regarding battery internal resistance, I discovered that many others were interested in the IR of all types of batteries. Lots of reading, but no explanations that I could find, of how those folks were determining the IR.

-- Cheers, WB .............

"Wild_Bill"

Those test probes will sure have to make GOOD contact with the cells.

... Phil

Why?

The comment EXPLAINS itself.

.... Phil

Assuming I RTFM'd the right manual, it's a Kelvin probe.

"mike"

.... Phil

Obviously, not the one you're on.

A tiny, very cold and dark place full of dribbling morons only in contact with Earth by usenet.

.... Phil