Batteries are interesting. The old D and C alkaline batts were a big improvement over having a carbine lamp on your miners helment. The Ni-Cad came along which, hard to believe, was initially developed clear back in 1899. Lots of work went into improving them. Those were the batteries that we used in our early mirrorless cameras and lots of other devices. I had about fifteen of them on different chargers all the time. They were kind of a pain. Then came Nikel-metal-hydride(hydroxide) that we use now for all types of things. Cars ran on them too. Then Lithium. Some countries have rules about what and how many different kinds of batteries are allowed. I think there are some couontries that still use NIMH. Lithium is expensive.
If I should die before I wake...great,a little more sleep.