But the battery will fail more as a relation to time than use.
Do you have anything that shows battery life use is time-dependent?
I have heard that it is the number of charging cycles?
IIRC the model P100D uses lithium-ion battery cells.
https://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_life
Manufacturers’ information typically specify lifespan in terms of the number of cycles (e.g., capacity dropping linearly to 80% over 500 cycles), with no mention of chronological age...
A 2015 study by Andreas Gutsch of the Karlsruhe Institute of Technology found that lithium-ion battery lifespan could vary by a factor of five, with some Li-ion cells losing 30% of their capacity after 1,000 cycles, and others having better capacity after 5,000 cycles.
Batteries are chemistry. And chemical reactions continue if the batteries are used or not. There is deterioration just from the chemical reactions.
“The typical estimated life of a Lithium-Ion battery is about two to three years or 300 to 500 charge cycles, whichever occurs first. One charge cycle is a period of use from fully charged, to fully discharged, and fully recharged again.”
https://www.quora.com/What-is-the-shelf-life-of-a-lithium-ion-battery-that-is-in-storage
Notice the “whichever occurs first”.
I should add that there is a lot of propaganda when it comes to electric cars. A lot of facts are hidden.