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I’m not much impressed with Mercury’s understanding of batteries.

I worked with several battery manufacturers in my career as an engineer working on submarine and nuclear missile batteries and charging systems and am very familiar with all of the standard test...

In reality, manufacturers determine MCA by the rigorous process of multiplying CCA by 1.3 and then rounding to a number they like. No one ever measures it. It is completely a made up number.

CCA. MCA is a marketing gimmick invented to make the battery sound bigger.