The battery replacement assumption is a common objection in my experience. People genuinely think you will have to replace your battery after 8-10 years. If true, this would really tip the calculations. I ask them how often they've replaced an engine. Well, hardly ever. Batteries are the same way. When the rest of the car is worn out, say at 200,000+ miles, most EV batteries will still have enough capacity to make a cheap and reliable commuter car.