Battery box on Maramu hull 192 is:
Length from inside forward end to pipe block aft: 43.25"
This is compressing the foam that is still in my battery box
on the engine room wall side.
I just changed from gel cells to 6v lead acid golf cart batteries
and am happy so far (about 1 year, live aboard). Maintenence is
minor and cost is far less. Have 6 115 AH for house bank.
Use 1 12v AGM (Lifeline) for engine and am also happy with it.
(about 3 years). Hangs on to its charge well when not used.