Yep, a big similarity to remanufacturing lithium batteries may be having more physical than chemical renewal, where the recycling process focuses on dismantling old and rebuilding new from reclaimed materials.

Restoring the functioning of the original electrodes in situ is a bit of a different ordeal. But they're working on it :)

It would be much easier if lead acid batteries were designed to allow flushing them easily. The biggest problem is the fill holes are absolutely terrible access for flushing and cleaning.

If they were easier to reuse like that and it was done more often then disposal for that lead saturated acid would likely be more available.