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As Brian implied, sometimes an old battery deteriorates until it takes only a "surface charge." The voltage may measure something that looks reasonable but the capacity of the battery to deliver the high current required of a starter (hundreds of Amperes) is gone. It might as well be a flashlight battery for all the good it does you. Auto service places and places that sell batteries usually have a load tester, as uberwagon said, that simulates the conditions a battery finds itself when you turn the key.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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