A Curious Battery Question

[redsky49]

My generator start battery receives the standard alternator charging regimen as would a regular flooded battery when the generator is running.

When the propulsion engine, or the shore side battery charger, is operating the generator start battery is charged according to the AGM requirements of my house batteries.

Hence the question:

Given the two differing charging profiles, would a standard flooded battery last longer, or would an AGM battery be a better choice for the generator start battery?

Generally, time on the hook might last as long as two or three weeks before there would be an opportunity to connect to shore power or run the engine for an extensive (more than one hour) time.

Anyone have any empirical data, or at least a semi-thoughtful wild ass guess???