Golf cart batteries
Close to the same setup I have. I use an "Optimist" Starting battery, It came with the boat. I''m curious, do t T-105''s have the cranking amps you need to start your motor? I was always under the impression that T-105''s were fantastic for the house bank but not so good for starting.
When my T-105''s kick off, I plan to replace them with the new 6v AGM''s that have come on the market.