Maybe I'm biased since my last EV only made it 6 years / 60k miles before needing a new battery (a 2011 LEAF) due to capacity loss (was down under 70% of the original capacity), but to get 270k miles and still have 70% remaining seems decent in the same amount of time. Yeah, since you drive a lot a new battery would do wonders, but I have to wonder if getting a replacement pack from
@wk057 for $4500 isn't a bad deal.
On the other hand, based on the fact that your car is having problems charging to 100%, that seems to be a sign of an out-of-balance pack, probably caused by one or more modules being significantly weaker than the rest and will probably qualify for warranty replacement soon.