The BEST method to test a car battery, Carbon Pile Load Test.

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My preferred method for testing batteries as a Technician using a Carbin Pile Load Tester, a multimeter, and an amperage clamp.
Test method: Put a Load on the battery at 1/2 the CCA rating for 15seconds, battery voltage should be able to maintain 9.6volts or more. Battery should be approximately 75% charged or more(12.4-12.6V) before Load testing or it may fail the test.
I prefer to test twice to avoid a surface charge hiding a weak battery. If battery is borderline failing, I charge to 100% and then retest twice to achieve a more accurate idea.
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Perfect!!!
I copied your method but had to switch my Fluke 376 FC from DC Amps to DC V once I reached my target as I only had one meter on me.
Your method is great! You just use the tester as a carbon pile only.

deadstartcrashkit