Which Optima red top battery is replacement for starting batteries for a 450 hp M11? Thanks, John
Group 34/78 is what I have. Recommend you check before buying Optima. Lots of comments about quality problems over the past couple of years.
I purchased 3 Optima red top starting batteries from Apex Batteries on line. Put the three in the FOT, then used the best coming out for a cranking battery in my boat. The serial nrs coming out were 0202 etc. so I thought they were the original batteries and really lasted a long time. Called Optima and they indicated the serial nrs were for 2010 batteries. So I have some good batteries after charging and took the old boat battery to Walmart for a $13.00 core return. Did not have to return the cores out of the FOT to Apex (a plus). First time I had purchased such batteries on line. No issues, each packaged separately due to weight. Good deal and big savings over Sam's price of $200 each. DAN