You can ALSO just get marine dual purpose batts
Robust enough for starting and still more tolerant to deep discharge than a standard starting batt.
Look at what you are cranking... Do you NEED 1000 cold cranking amps to start a 25, 50, 100, or whatever hp outboard in say 60-90* or whatever temps you boat in.
For reference my 4.0L jeep takes a little over 400 amps to start at 80 degrees and my dually w a 7.3 Powerstroke diesel takes @750 amps at the same temp.
Edit: Ferm and I were typing at the same time.
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