at a guess, over 80%, probably over 90% now.Hmm, how much demand for lead do lead acid batteries represent? It seems that lithium ion and perhaps other batteries may undermine demand for lead acid.
globally it would be about 500 gWh annual production rate
if each EV-scooter/motor bike in China uses 2 batteries, thats a larger demand than China's car industry.
wild guess, 98% of battery Pb is recycled, so the 'stockpile' of Pb is about 98% x 80% x twenty years of something big. Its an immense stockpile in use in batteries around the world, and its growing. If cost for China to process this into a battery is $20/kWh then when the price turns to zero, that is a massive amount of cheap battery that can be made. Not at current Pb prices though.
Permission to use Pb in EU cars has already been rescinded, there is an clause along the lines of there must be an alternative in existence. Since there is no alternative on the market yet in existence, EU continues with Pb batteries, but there is a cliff ahead, because the phase out is already in law. Tesla losing 12volt is very significant. But a starter Pb battery is still needed.
The other thing, there are very few Pb only mines, vast majority is co-production with Silver and/or Zinc. The galena must be extracted to get the Silver or Zinc, so its really a supply that is dependent on other demand, not Pb demand. Pb price could fall 90% and supply will still be robust, if Silver and Zinc improve sufficiently. If Silver goes up 50% and Pb goes to zero, there will be Pb mines increasing their profits. I can't think of a commodity more exposed to downside than Pb, yet their miners possibly more exposed to upside. Strange.