If i were to replace the standard Interstate batteries out for the trolling motor to lithium, what size battery would be best? 100Ah is probably overkill since i dont tournament fish and im not standing on the trolling motor all day. but would 50 or 60 AH be enough to get you through a windy day on current? 100AH are just so stupid expensive. You can get 2 50AH for the price of 1 100AH. I guess im asking if any of you have lithiums, what Ah are yours? i have a 24V trolling motor with 80lb thrust which is plenty to pull the .204 around easily.