I have ordered 4 new 100AH Lithium batteries for my boat. I have 3 that will run my 112 Ultrex and 1 that will be my starting/electronics battery. They are all identical batteries and according to where I bought them from they will all work for their specific purchase. My question is how should I properly charge them? I was advised by the company that a 10 amp charger is better than a 15 amp charger for these batteries. I was looking at getting a 4 bank Dual Pro Sportsman as it is a 10 amp per bank charger. Should I get a 4 bank charger or should I charge the trolling motor batteries off a 3 bank and do something different with the start battery? Will the charge coming from the engine affect this battery in any way? If anyone else has this set up and would share how they are charging their batteries I would appreciate any advice.