There are 2 batteries in my Tracker Pro Crappie, one is the cranking battery, the other is the deep cycle battery for the trolling motor. Currently I am using chargers that are supposed to fully charge the batteries, then switch to trickle charge to keep them charged. Is this the best method to charge the batteries? The boat is not used that often, but when it is the trolling battery is often killed by excessive trolling, or setting up lights for night fishing. What methods do ya'll use to charge your batteries?