Car died during driving

67Dart273 said

This is NOT a sure thing. .........The battery in my case worked FINE for awhile, until I CAUGHT it "dead" and checked voltage right at the posts. When it DID work you could load test the you-know-what out of it and it would be "fine."

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Thats over 1 in 1000 rare. A load tester,carbon pile type will find a faulty battery. There is no other tester on the planet that will do better. The milton toggle switch tester is a 50 amp load,maybe 100. Cheap carbon pile testers pull more than your average starter.
There is no digital tester that will properly test a battery. Not a single one. Not snap on not mac-not one. I spent 3 years in one shop,digital testers sell batteries. Exactly what they are designed to do. Shop used digital,i repeated test with carbon pile. 30% miss,either a good battery that tested bad or vice-versa.