Battery Desulfators

Maybe one of these folks:

Good Luck! Rich

This might answer some questions, especially the original article link:

Have fun...

Peter

does this really work ,,, i know it really creates pulses, i mean does it really bring the batteries back to life?

Mark

"Andy" wrote in news:1114163987.421009.209920 @o13g2000cwo.googlegroups.com:

Check

It refere to Jim Weir's articles. I thing he has had some hands on experience.

"Mark" wrote in news:1114224245.975864.244140 @z14g2000cwz.googlegroups.com:

I don't know. I think that would be a good question to pose to Jim Weir.

This is my personal experience, about 40 years ago. I bought a small surplus dry-charged 6V lead acid battery made in the

40's for the war. Added acid and it was dead - so dead that even with 100V across it the current was only a few mA. So i put it across the line (120VAC with a current limiting resistor (about 100mA); took a week to come up that far. Then i rigged it with a capacitor in series and a reverse polarity protection diode across the battery and used that scheme to pump more cycling current thru the battery and charge it at the same time. Stopped that when the AC current was near an amp and changed again. Used a 12V filament xfmr as source, current limiting resistor and same reverse polarity protection diode across the battery, until the AC current was 3 amps or so. From then on, i used a resistor to discharge it to 10V, and a standard charger to bring it back up; 5 or 6 times. Short circuit current from this dinky "motorcycle" battery was over 100 amps when i got done rejuvenating it. Took a few months overall.

"Sulphation" is the term and the problem. It must be broken up, and the smaller the particles that result, the better the results will be. Keep the cycling current low, and AC is OK when that current is far less than the rating (C/1000 or less i would say). When the current gets in the region of C/200 or so, go with charge/discharge and no reverse current (hence that protection diode). I do not think that the waveform matters much.

I have not looked at the references given by others in this thread.