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Only problem with depending totally on specific gravities for determining when to swap out a battery is that other factors (internal resistance, cell weak bridging, etc.) will not be detected until the car strands you. A fifteen second load test will not only catch weak electrolyte (low SG), but will catch the other issues as well. The same load test unit can also test your alternator for diode response and voltage regulator activity, all at the same time, which is why load testing has become the standard test for battery replacement…………….
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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