I have a used Optima Group 27, model D27M, 1000MCA, AGM Blue Top Battey that was new in Sept 2015. $250 Retail. Very good deal @ $80 cash picked up in Apex. Still showing 12.7 volts. I estimate at 85%. Cranked Merc 250, 2 HDS, 2 power poles all day 2-3 days/ week. Replaced w/ group 31 AGM. Includes T&H Marine HD battery tray w/ metal buckle. Bill 919-723-8569