Gents. Only had our boat for a year, we use it a lot. Charge it up and burn it down pretty quickly as we stay out all day dmost outings. The battery seems to die down rather quickly. We have one battery up front and one in the back. We have an on board charger that we just plug in which is nice. We are going on a 4 day trip, and want to either replace it or have a spare.

Any recommended brands of batteries?