I'm wondering the same thing about the Everstart MAXX for my main battery. Mine is 3 years old and i want to pick up a replacement, and those **** yellow tops are so expensive.
I Bought The Biggest Badest Battery From Auto Zone...forget The Name(duralast?) But It Was 1000 Cca's And 900 Ca's Forget What The Reserve Was Maybe 120 Or Sumtin