So this year I replaced my 4 year old trolling motor batteries because last year I noticed that a few days after a full charge my trolling motor battery meter was showing the level down to three bars. After installing new batteries I am seeing the same thing. I have a good 3 bank charger and always un plug the trolling motor and there is nothing else on the circuit. I also have a lite portable minn kota tester that shows the same battery drain. Any ideas?