[fencepost]

Hm, do the batteries used by Tesla have the same kind of "extended lifespan if rarely fully charged" issues that apply to the kind of cells used in most laptops? If so, then I'd be curious about whether this is implemented as a cap on the battery charge - I might actually prefer the lower capacity if it means my batteries last years longer.

[mikeash]

Yes to all. However, unlike most consumer electronics, Teslas allow you to manually set the maximum charge it will take at any given time. I usually keep mine at 90%, for example, and only charge to 100% for long trips.

If you take the 75 option, you could keep the charge limiter set to 80% for normal use and achieve the same effect as keeping a software-limited 60 at 100%, but with the option to bump it up when you need more.