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Location: Green Bay, WI | I believe my Verado is wired to a group 31 (it might even be group 34), with about 1000 cranking amps. I haven't looked in a while, to be honest, but I seem to recall that it was a group 31. Mercury tends to really push for high capacity batteries on the Verado engines, simply because so much depends upon flowing electrons--DTS, SmartCraft gauges, power steering, the ECU. I don't know anything about Opti engines, but if you have the DTS and SmartCraft gauges, I bet you'll need just as big a battery as the Verado does.
If you're worried, make sure that you at least have a long pair of jumper cables on board, so that you can run from a trolling motor battery to the start battery. I have had to jump a start battery in an old boat more than once.
TB
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