Thanks for the elaboration!
I "test" batteries in the following manner...
Hydrometer dip. If any samples come up smoky colored or red, end of test regardless of what a carbon pile load tester or impedance tester indicates
Next is a 1/2 CCA adjustable carbon pile load test. If the battery is supposedly fully charged (hydrometer) and fails this test. Awaaaaay......
The impedance test. This is like creating a fine finish with 800 grit sandpaper. I use this test mostly on single cell entities.
If the battery passes all three tests then it is a guaranteed healthy specimen.
But clarity of electrolyte is essential. It may argue with the other three tests (gravity, load, and impedance), but it over-rides, trumps, the other tests.
Please note, there is a difference between "Good" and "Good Enough For Me". Some customers used to nursemaid basket cases - which would have driven other customers up a wall. Like William Jefferson Clinton, once quoted "It depends on the word 'IS'"
By the way, a modern "real" electronic battery analyzer costs in excess of thirty thousand dollars. IMHO they absolutely do not do as good a job as the hydrometer, carbon pile loader, and impedance testers when all three are employed.
