I checked my Yanmar manual and it looks like it calls for a 100 Ahr battery for my 3 cyl 35hp diesel.
So now you ask yourself, how do I compare CCA to Ahrs. The short answer is, you don't. CCA is a bit arbitrary but to achieve higher CCA in the same size you have to have more and thinner plates. This makes them more fragile and decreases their ability to be deaply discharged as well as survive vibration and uncovering. If you seek higher CCA exclusively then you will find a battery which is less suited for a marine environment. AHrs is a less arbitrary spec but still a small bit of fuzzy math since C/20 = 100 and C/10 = 80 and C/1 = 60 could all be Ahr ratings for the same battery. Most manufacturers provide their rating based on C/20. Ultimately, the best batteries (regarless of all other ratings) are the ones which are heaviest. These will have the most lead and subsequently the strongest plates. They will usually also be at the top end of the Ahr ratings but not the highest CCA (if those ratings are even mutually present). Disregard CA and RC ratings. A sufficiently large deep cycle battery is better than a smaller, lighter, starting battery. The weight is only an accurate comparison if the chemistry is the same. Josh
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