[MetroMPG]

It's important to understand what "lifespan" means in terms of industry standards as well.

By several definitions I've read, a battery is considered worn out when its capacity is 80% of new.

(I don't know what the auto industry standard is for EV packs.)

So barring a cell failure that disables the pack, you can keep on using it past the due date as long as it continues to meet your range requirements.

Some observers expect to see a new industry spring up: repurposing "dead" EV batteries that still have a lot of life left in them, for other non-auto applications.