There are many more variables that matter that I can think of, How long battery holds charge How it behave at various temperatures How it degrades over time

There are many more variables that matter that I can think of, How long battery holds charge How it behave at various temperatures How it degrades over time How it behaves in its discharge life cycle, e.g can you drain it to 30 percent? 20? Do you have to charge it to 100? Hence, why we havnt seen radical innovation in the battery space in the last 20 years though we see articles like this all the time. I'm still buying lithium etfs.