Cheap Reliable Battery Load Testing
https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html Bulletproof way to test wet and AGM batteries Like a hospital heart stress test EDIT: Fixed the URL.
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Best 55 diagnostic bucks a person will ever spend. Will NEVER pass a battery with problems and will find batteries with beautiful specific gravity yet bad. I Jjust load tested my 9 year old AGM by loading it to 500 amps @ 9.9 volts. That's 1000 CCA
