What's the life span of a battery in an EV?

I am becoming more interested in purchasing an electric car and at the age of 72 and a low mileage driver want it to last a long time. I imagine that the battery in an electric car is a lot different from...

Will the batteries of EVs be expensive to replace?

At some point in the future, the batteries on electric cars will need to be replaced. I have yet to see any indication of the cost of this. I expect it to be expensive and must surely impact on the second-hand...