Just a note. On my 2021 Leaf, there is a long term storage fuse you can pull. It doesn't come out, you just slide it toward you until it stops. I've been told that it stops all power drain from the batteries. I assume it also disconnects the 12V battery. A friend has repeatedly left his ICE car stored for up to 7 months with the 12V battery disconnected over the winter. In the spring, it always starts right up.
The fuse is inside the compartment at the left end of the dashboard. There's a not-very-good picture of it in my owners manual. It you have trouble finding it, take the car to a dealer and ask them to show you where it is.