Just been looking at "hybrid" replacement batteries... A guy from a company that refurbishes these, and larger traction batteries for Battery only cars, says that it is all down to duty cycle. A Taxi, (24 hour town use) will probably need a hybrid battery replacing after 5 years, for £2~300. A Nissan Leaf, £3000-ish, A Tesla (Huge money!).
But a domestic user, commuting, etc. so the car is parked for 23 or 24 hours a day, will get between 8 and 12 years use, before the warning lights say "Use-by-date exceeded". But the battery may be "re-furbished" for less than that. And the industry is getting more recycled batteries for second use anyway, so prices are coming down year on year.
Suppose you do 10,000miles per year, saving 10p per mile on "liquid fuel" by using electricity from the grid.
You have saved £1000 per year, = £10,000 in 10 years, so £3000 for a replacement battery after 10 years won't worry many customers who do not keep cars for more than 5 years from new. But some are replacing after 3~5 years for "latest technology and more range"... so I read somewhere.
All the cells are recycled into "Domestic storage batteries" (to link to your solar panels), and other applications. Any shorted cells are re-cycled so the minerals (Lithium can be Highly Flammable - so do not open up a cell!) are recycled anyway. I think Lithium comes from sea water? So can be returned? But cheaper to recycle - apparently?
But I don't know how accurate my "education" has been on the subject. I just "plugged the batteries into the Nissan Leaf!" as a part of the test work.
The biggest risk to mechanics is Electric Shock. 380V DC will lock you solid and kill you in a minute or so. You can't scream with locked muscles. So don't risk it. It probably hurts like hell as well.
K2