I agree with "G" .... but, would first want to know what size/brand batteries you're currently using for each setup (big motor - electronics - trolling motor - and any combination).
Will have to check can’t remember. I know trolling batteries are series 31 and I think other two are 24 series. Trolling are 2 years old but no idea on 24 series they were in boat when I got it almost 3 years ago