Not a lot yet. Most of the batteries produced are still being used. A decade ago there barely were any EVs on the road. Production volumes at Tesla were in the thousands per year, not per week. Most of those cars are still driving fine. And by now, most manufacturers give eight year warranties on their batteries and drive trains. Meaning, they don't expect them to start failing until long after that date.
You are thinking about this wrong. The value of the lithium inside those cars is higher than a lot of second hand ICE cars. There can be tens of kilos of lithium in a typical EV. The price of lithium is about 30-40$/kilo currently. That could come down. But it's way more valuable than iron, lead, aluminium, etc.
You are thinking about this wrong. The value of the lithium inside those cars is higher than a lot of second hand ICE cars. There can be tens of kilos of lithium in a typical EV. The price of lithium is about 30-40$/kilo currently. That could come down. But it's way more valuable than iron, lead, aluminium, etc.