Tip:
Some posts like to deteriorate to lead galena. Black costing. Hard as obsidian. Galena laughs at battery brushes. Takes a knife and chipping top to bottom to remove this coating. Be careful of chewing up the lead post. Mating lugs also can suffer. Takes a knife to remove. Wear glasses. A chip of this in the eye is agony incarnate.
Sometimes an intercell STRAP inside the battery, fractures. When this happens, the battery can support a modest load, but when cranking amperage is applied it goes deader than a doornail. Five minutes later it can recover and support a modest load again. The fracture soon deteriorates. Would this be a Johnson Controls battery?
