I'll bite. At best, a new pair of Interstate series 29 deep-cycle marine batteries were lasting me just over 4 hours when trolling Bandits at 1.7mph in my 1860 Horizon boat with my Terrova 80 I-pilot on cruise control. Those batteries were around $100 each. Which battery would best suit my needs and what would the approximate price per battery be. My typical day on the water would be trolling or long-lining until my batteries are pretty much fully discharged.