Ford rates their MC650 batteries as "medium duty".
However, they fail to acknowledge that given all the tech on the SHO's, that battery has consistently underserved the platform.
The average lifespan has shown to be 2.5 to 3yrs.
I myself upgraded to the 850, and have had better luck since then. Which is what these car's should've came with right off of/from the production line.
Damn bean counters.
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