I have yet to see any data about battery wear before the car's end of life. I looked quite a bit before buying, but even high mileage 100,000 vehicles didn't report wear or even significant capacity loss (rechargable batteries often lose capacity as they wear). Some have been replaced due to physical damage, manufacturing defect (this shows early), etc. We are all very interested in actual data on battery failure, but for data there will need to be enough cases to make meaningful conclusions (statistically overcome possibily of chance)

Statistically speaking, you have about the same chance at 110,000 miles of your engine cylanders getting a hole in them.

I'm hoping advances in battery tech will let me upgrade someday (plug in hybrid maybe?) but gut tells me probably that would be a newer model car