Had to replace trolling motor batteries in my boat today. I have always used wally world batteries lead acid. As I am getting to old to do this l went with agm Duracell batteries hoping to get a little more life out of fhem. Question I have a pro mariner 3 bank gen 3 battery charger that is a couple years old. I need to switch it from lead acid to agm and I don't have a clue how to do this. Charger is several years old but works good. Can it be switched and what is the process of do I need to buy a new charger. Thanks