The Best with the Most
I don't see the reasonning about the one item that effects so much of our beloved Benz as the Battery. It lasts 60 months and pro rated how much is that per month, you figure it. Put your concern to rest, get the largest capacity(1,000,000 CCA and 999,999 reserve amps). Take care of it and you wont loose. As for testing your battery with a volt meter, save your effort. Use a hydrometer!(it's cheaper too). In closing the El Katuna has these remarks,"BIGGER IS BETTER". Happy Trails Beep Beep from fully charged Houston.
fully charged at sp/gr 1.275