Does that replacement cost for the Leaf battery include the core credit for returning the old battery? Those batteries still have value, and if they can be re-manufactured or re-purposed as stationary storage batteries, that could reduce the cost significantly.
Depends on how much the old battery is worth. It's like replacing your transmission in an ICE. When you replace your transmission, you get a rebuilt one for like $1k. The actual price for a transmission is like $2, but if you send them the broken one from your car to rebuild for the next car, you get a Core credit.