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In the past, I've tested batteries for capability
by charging till they reach a maximum hygrometer reading for that battery.
Charge at a low (10 - 15 amp) rate until reading stabilizes (stops
rising). This may be at 1.250+ (hurray) or more likely in the 1.1xx
area. Then make a load bank ( you can use auto headlight bulbs in
parallel) of 50 to 75 amps and discharge. Measure time to a fixed
voltage around 5.2 volts. This gives you a good idea of
condition.
This could be either before or after cleaning and
replacing acid. Incidentally, old=timers used to "de-sulfate" by using a
high voltage reverse pulse. I don't know how they generated
it.
Wombat
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