Lead acid batteries are used in pretty much everything ICE vehicle and are used in large quantities as uninterruptible power supplies (data centers use a ton). It's a huge industry.
Lithium Ion attached to a supercapacitor with a sophisticated BMS is a much more complex setup-- yet even so, it will probably end up being the gold standard in the long run at this point, I would say even in most places lead-acid is still being used. I would not have predicted anything like that even five years ago, but barring some unlikely breakthrough it seems like where we're headed.