Yes, an in fact IMO that makes the used models even more of a steal. Get a several year old model with a pretty much new battery. The battery is pretty much the main wear item in the whole drivetrain, so its like buying a used ICE with a brand new drive train.
Yeah they are fixed. A Bolt is a nice vehicle to buy if you don't mind its slow charging; and judging by the number of Bolts on the road plenty of people don't mind.