Yamaha F25Lwhc electric start battery

[Mcgreg]

Question for those in the know here about battery ratings for a new motor. Manual calls for starting battery with a 245-430 cca and an rc of 53 minutes.
I want to use a much bigger deep cycle battery already in the boat, a size 29, with approx cca of 750 and rc of 170. My concern is not with starting as the motor also has rope start, but is with a discharged battery from a hard day fishing potentially causing excessive draw load from the alternator trying to recharge it while motoring to next spot. Is there a concern here blowing the alternator or am i overthinking it? Dealer didnt know.
Please advise and thanks in advance!

 

[99yam40]

look up how many amps your motors charging system will put out,
it will not put out any more than that, and I would not think a small motor would put out very much, but I do not know how much.
make sure you use a charger to get the battery back up to full charge before heading back out again if you are using so much power while fishing