Originally posted by rdanz
If it ain't broke don't fix it.
I'm with that.
When you do need a new battery, your OE battery is also available in an InterState model, just as good as OE, priced about the same, but with longer warranty. The OE battery is huge, and I'm not sure about where you live, but not many "box stores" in my parts carry a true fit. They have something that will go in, but not the same performance as the OE battery.
btw, when it is time to replace it, and if you want an MB battery, call roadside assitance. They'll bring it out to you, install it, and only charge you for the part.