What do you mean? If you’re referring to lithium battery powered aircraft my understanding is that will never be viable for anything but the smallest aircraft.
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.