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Upon further digging, I found another article on this subject and it seems the Faztbullet and saltchuckmatt comments are on track with their comments a wet cell battery is necessary and the charging voltage requirements to charge the AGM battery do not match the CDI Electronics rectifier/regulator output across the RPM range.
This article mentions: "AGM batteries, dry cell batteries and maintenance free batteries offer too high of a resistance within themselves that does not allow the charging system to see when the battery is full and lower the charging rate preventing itself from not only overheating but keeps on charging at full output until something cooks off and its usually the charging system that goes volcanic.
an old lead acid battery could be charged at full output and would absorb the extra voltage without harm to either the battery or the outboards charging system.
I have an article that does a good job of explaining what I am trying to say for those who want to study it further, just pm me and I will send it to you."
I am not a member of his forum to request a copy of his source article. Regardless here is the link: The Right Battery for Your Outboard