Originally Posted by CraZyNOTRT
I actually have an old 1983 mercury black max 150 good old 2 stroke.

Mercury Optimax requires per manual. "The engine must use a marine starting
battery with 1000 MCA, 800 CCA, or 180 Ah rating"

marine cranking amps is not the same as CCA.


Yep, I know that but I thought it was 1000 CCA per manual. I guess I need to look again.

2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L