I need to buy two batteries. I need one for starting my outboard, which I guess does not need to be a deep cycle battery. I also need a deep cycle battery to power lights, vhf, stereo ect. I been seeing these batteries that claim to do both. I am generaly skeptical of these claims. I do know that marine batteries have thicker plates and can withstand the abuse better. My motor is a 1970 85hp Johnson. Whats the best deal? Most bang for buck? I do not want to spend 400 bucks on batteries, but I dont want to buy garbage either! Thanks!