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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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