The batteryMINDer, atleast the little $40, 1.3 amp model will slowly desulfate a sulfated battery, although it can take months on a severly sulfated one. I had one in a rolled over Hough payloader I bought. Big 12V battery that laid upside down for several hours when the machine rolled and killed the operator. All the electrolyte drained out while it laid upsidedown then the battery and machine laid in a salvage yard for a year, so the battery was sulfated almost beyond hope with the plates exposed to air for a year.
I bought the machine , refilled the battery with new electrolyte and put it on the desulfator. after a week it would put out enough to engage the starter and roll the engine about 1/2 turn. After a couple more weeks it would start the engine. After several months of use and desulfating it would crank much longer than the starter could safelt take. I would guess that battery regained 90% of new capacity.
bottom line, is that a charger with the desulfate feature will slowly remove the sulfation from a sulfated but otherwise healthy battery. It in no way will magically restore a shorted or worn out battery. I see the latest BatteryMINDer model now has temperature compensation so it better maintains full charge without overcharging in temps from -40 to +130.
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