Posted on 02/23/2019 10:11:35 PM PST by blueplum
Lead sulfate covers one set of plates in a dead battery, a coating which hardens with time. Some commercial chargers blast higher voltage at low amps through the battery to fracture the hard crust and initiate a charge. If successful, most of the sulfur dissolves and once more forms diluted sulfuric acid electrolyte.
A charged starter battery always has dense electrolyte with a specific gravity about one-quarter higher than water. Dead battery has dilute acidic water left inside, which freezes more easily.
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