Consider: your car can charge at some maximum rate. Let’s call it 200kw. That means you can add so many miles of range per minute of charging. Is it really that important whether that charging occurs during one thirty-minute stop or two fifteen-minute stops?

When you make the battery really big, you increase the weight of the car. The number of miles of range per kWh goes down.

Actually, it’s not optimal to use the entire range between each stop, because the battery car charge faster between (very roughly) 20% and 80%.

The most important thing is to have a lot of charging stations in spots that you can very quickly access from the highway. Then you can stop when optimal and minimize the amount of wasted time (your car’s navigation should tell you when).

At some point, putting even more batteries in the car will not get you there faster. Barring some big breakthrough in battery tech (or swaps), gas cars will have the advantage in miles per minute added during fueling.

There are cars with 400 mile range, but think hard about whether that is really what you want. It’ll cost you more to buy and charge, and the utility you get may not be worth it.