Anybody who has a knowledge about battery, I have '96 750iL (E38), 5.4 L V-12. Today I was looking at the Batteies at Wall-Mart , p/n 108-H8 and p/n 108-H6(Cranking Amps 950, Cold Cranking Amps 760 Amps and "Energizer, Supplied by Johnson Controls, Milwaukee, Wis.) seem to be comparable to my existing battery that I may possibly buy and use it for future when the time comes to replace them. The OEM battery for my Bimmer is about $350-$400 at the Dealers. But the Battery at the Wal-Mart sells for $100 and so on. What would you suggest----???