I run a minn kota 2 bank for the starting battery and backup because it came with the boat. I use 3 of these on my lithiums for the 36v TM.

https://www.amazon.com/Mroinge-Main...61572682&s=sporting-goods&sr=8-1

They are 5.5a and have a lifepo4 setting for the lithium batteries that drops the float voltage down to a level where overcharging is not a concern even if the internal battery management system fails. Work fine so far. I kind of like having them separate since I run 2 differing chemistries. They remember how they were previously set and start charging when plugged in. The outputs are isolated just like multibank units so you can leave everything hooked up.