Hmm, this is the first time I've seen the problem explained that way, you're right, and I think it illuminates the end goal EV's need to reach for, while weight is any consideration. Modular batteries at certain interval ranges. Most trips, keep one 70 mile range battery in, the rest garaged. Leaving for a long road trip? Plug in the other 5 battery packs for a 420 mile range.