So I need the 100AH. Folks trying to sell me 50ah in town.
I’m just a weekend warrior fishing for the most part.
They said oh that’s plenty.
Which raises the question. Buy three 12 volt or one 36volt.
Considering your situation, I think your original plan to buy a single 36v battery is a good one. And unless you are going to use it in an unusual way, I think a 50ah would work for you. I don't know the exact weight of the battery you are considering, but a 50 is going to be easily manageable when removing from the boat, but a 100 is going to be heavy enough to get your attention.
It's not an apples to apples comparison, but my first lithium batteries for my 24 volt Maxxum were a pair of 12v 50ah. These were the cheapest I could find -$99 each on Amazon. They worked great for about a year, but we went to the river one day when the water was high and I had to run the motor on high and run it almost constantly. About 3 pm, they shut down. There was nothing wrong, I had just drained the power. I probably used 5 times the normal amount of power that day, but I didn't like running out. I replaced them with 100ah and no problems since.
Everything in a boat is a compromise. In your case, I would think the rare chance of running out of power in a day is worth having a battery that's easy to remove each day. Of course, if you bench press 800 lbs this might not be an issue.
