I know this has been discussed before but I need some clarification. What is the difference between the d34m,31m and 34m. I believe I have even seen a d31m? Are the "d" combination batteries with high cranking amps as well as a deep cycle? I am looking for a quality and have had good luck with the optimas but just want to make sure I am buying the correct one for the new boat. The cost of a quality battery is worth the hassle of not having to worry about it to me. Also, Does anybody have any opinions on more cost effective alternatives?
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