My buddy has a 28 lb and it has worked on a 16 ft boat for over 20 years and the nice little 30lb battery has never died in a single day of fishing.
Get a suitable proper sized battery, for a 30 lb and I think you wil be satisfied. A 55 lb requires a lot more juice and a LOT heavier battery.

You are carrying the battery to and from your vehicle to the boat and house. I am sure you will not be happy lugging a 75 lb battery back and forth. If the battery stays in the boat go ahead and get a big one.

I lug a battery between 2 boats that are feet apart and it is back breaking just doing that.

Keep it light and simple and you will fish more.