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There are a million different opinions on this and boat batteries can range from $59.95 to 599.95. After 20 years of boating and replacing boat batteries from a 15 ft to a 36 ft boat, I have come to the conclusion that for the price, Interstate Marine batteries are probably the best value. They have a cranking series if you are just using them for the engine and a few low amp draw accessories, (vhf, gps, fishfinder) and a great dual purpose cranking deep cycle if you have a trolling motor or just believe you will be out on the water for extended periods. Pricing was around $130 for 27 series dual purpose and around $100 for 24 series cranking. 24 series is standard on whalers so if you go for the dual purpose you will have to replace your battery box as they are a couple of inches wider. You can go on the net to find a dealer near you and some local Sams Clubs have a deal on them in the spring and early summer if you are a member.