What does small mean? We have puddle jumpers (few miles between islands) already in service, like 5-10 miles. I expect it to creep up over time as efficiency slight increases but battery energy increases at the battery moore's law like rate it has. Prices go down and capacity/weight goes up.

I agree it will have limits, I doubt I'll see long flights like 200 miles. But I see no reason it can't improve by 10% a year just like the batteries. I believe the ones in service are using lfp batteries, which are safer than lithium batteries, but also have lower energy density - and these have gone up over time too in energy density.