Hi guys ,I have an 87 bayliner f&s 18 ft with a 125 hp motor and in the process of purchasing new batteries .For the starter there 's two batteries but not sure which one to get, #1 is a 27 dc with 675 cca #2 is a 24 m with 800 cca .I have lots of room ,it's just a matter of putting it in .What...