To put it simply, a 12 volt battery needs to be charged at 15.5 to 16 volts to break down sulphation. That's what the better chargers do when put into "equalization" mode.
When a battery is "dead", i.e. down to 10.5 volts the plates are then covered with lead-sulfate. If charged back up in a reasonable amount of time, that lead-sulfate falls apart since it's a soft material. But . . let a battery sit for a long time while discharged and the lead-sulfate turns into hard crystals. A standard battery charger that barely reaches 14 volts cannot break it apart. This "over-volting" called "equalization" breaks down lead-sulfate crystals and also stratafies the acid - i.e. mixes it up.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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