Negative.
Mercury Marine approves the use of any lithium battery that meets the specifications set for in the service bulletin. A battery by Relion happens to meet the specification.
Mercury Marine has issued a service bulletin that approves a number of their models for use with lithium starting/dual purpose batteries where the alternator of the motor does all of the charging.
I suppose that on the basis that Mercury says it is OK, many Yamaha, Suzuki, Honda and Evinrude...
Agreed. If we are talking about a lesser quality part.
To me it depends upon the particular part(s) and its intended application. If a component of an electrical starting system fails on a motor that also has manual cranking capability (OP's configuration) that would not be the end of the...