For Sale: ProMariner ProTournament 360 elite two bank battery charger. I bought this to upgrade the battery charger on my Grady 330 express but then realized that I needed the four bank to charge my four battery setup. $350
If your batteries are grouped into two banks of two parallel batteries, and the paralleled batteries are similar model and age, a single port is OK to charge them ( and 2 ports for 4 batteries). A four port charger for four batteries can handle some situations better BUT it has to have four distinct grounds in addition to four charge wires. Not all multi-port models do.
I'm not sure if this 2 bank battery charger was sufficient enough for my 4 batteries (2 bank set up) I did some research and decided to buy the four bank for my boat. This charger for sale is in like new condition.