I need to buy a used car battery, because of cost. ... I know measuring, not voltage, but max amperage a nimh AA can put out is a better indication of health (internal resistance); so, below 1.5 amp max and I can toss it out, as it will refuse to smart charge anyway.
I would expect a lead acid battery (if comparable to nimh) would put out 24 amps on such a test (12 x 2 amps). My meter goes to 10 amps.
How to properly test. (testing voltage before and been burned before).