When I bought my 97 XJ last summer it came with an Exide lead acid of unknown age. The Jeep always starts. The problem is that I get a reside on the top of the battery that I am always cleaning off. At least once its caused corrosion on the battery cables. I popped the covers and it does not look overfilled. I am thinking of replacing it with a AGM type battery. Any suggestions on preferred source/brand? I am thinking Advance or Auto Zone for availability and warranty but only if they are any good. I will not use Optima anything.