I bought a pontoon boat recently that came with a trolling motor and a newer looking 12 volt battery. My question is about battery charging. I have an old car battery "trickle" charger that has a gauge, green meaning full charge. I think it charges full overnight on a car battery. I haven't used it in years. Any suggestions on charging? How long does a charge last when using one of these little MinKota motors? The pontoon boat is light, maybe 100lbs. Should I buy a charger that is designed for boat batterys?