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Hydrometer is best. Messy, but quantitative.
One could measure the capacity with a lighter load. The ampere-hour, AH, rating of a battery is based on a 20-hour discharge with a constant current (AH/20, e.g., a 100 AH battery would be discharged at a 5 A rate.) until the battery reaches 10.5 volts and that is the most accurate means of testing the capacity, but shouldn't be done often as it will shorten the life of the battery. It's sort of like testing to determine how good the battery WAS. The 100 A load tester is usually applied for 10 seconds and gives an indication of the reserve capacity in a less destructive way. It's not very quantitative, but will indicate a weak battery.
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