Quote Originally Posted by GolfGL View Post
I only got 3 years out of my S4 battery. I bought OEM Audi (I think it was made by Varta) and replaced myself. I went through the VCDS coding procedure. I think you may not gain the full benefits of a brand new battery as the car likely thinks the nominal charge capacity of the new battery is lower and may not attempt to charge to design or full capacity. I think the BCM code also accounts for different vendors, capacities etc.
you didn't get your battery warrantied? Im assuming you bought it new. The battery should be covered for base factory warranty.

Also I would figure 4-5 years for battery life. Anything over that is gravy. but up to 10 years that's crazy. Maybe for a AGM battery or something more than a lead acid.