Battery desulfator
Hi John, hi Eric,
the idea of reverse charging (which is indeed connecting the charging device the other way round (+ to - and - to +)) isn't new at all.
Reverse pulsing is also used to manufacture double sided PCBs. Applying steady DC vias and through holes normally become considerably small on both sides of the PCB. Applying reverse pulsing the vias become as smooth as the plain surfaces.
Having this in mind I made an experiment with a very tired motorbyce battery. I could observe what happened inside the battery because its container was made of transparent material. One electrode in a battery turns into pure lead with a ligh grey surface. Both electrodes were almost black when I first charged the battery.
Charging of that 6.5Ah battery was terminated manually at 7.2V battery voltage. After five hours the battery voltage was again down to 4.5V. So I tried the above described method. The analog Ammeter of the 25A max charger clicks very loud when polarity is changed reaching the end of the scale, so I assume the reverse current is somewhere in the 100A range.
Anyway, after 6 full charge and discharge cycles the battery is almost like new. 24 hours after a charge cycle the battery voltage is stable at 6.5V.
I'm a very cautious person, and that's the reason why I don't use protective clothing or goggles.
Attachment: PCB with and without reverse pulsing.
Regards
Hans