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Our boat had an Exide Marine Starting Battery, Group 27M, dated 2015. These are rather large batteries with 1000 MRA, 800 CCA and 180 minute reserve capacity. Has regular posts as well as screw on terminals. Has a handle as well. It’s been kept on a battery Tender in the off season.
We bought a new battery so if anyone wants it for their trailer, $18 which is the core charge.