You need both the AllCharge and StayNCharge products.
A little trick I've learned is to take a little more time moving to another part of the lake, keeping the RPMs down around 3,000 for greater fuel economy. The alternator puts out the same juice at 3K as it does at 5K. That extra 5 minutes outboarding really helps top a battery off. The extra time is spent looking closer at baitfish schools, structure, any signs leading me to consider fishing along the main lake route between point A & B.
These two products are the best purchase decision I've made in years. I chose a boat with motor, but gave no thought to something like this until I needed them and saw they were available. I installed two 55 watt fog lamps on the bow, which have saved my bacon several times, something that's now catching on big here among night anglers, but if given the choice I'd have to ditch the lights.
Jim