https://electrek.co/2021/07/09/nio-plan-open-battery-swap-st...
You can rent the batteries and upgrade and downgrade the capacity as you like. It also makes it easy to replace the battery in the future if you buy it outright.
They offer 70 and 100 kWh packs now. They're aiming for 150 kWh packs next year:
https://insideevs.com/news/465188/nio-150-kwh-solid-state-ba...