I hate all batteries that can't be replaced by a wired connection.

Batteries are good and ok in things that have a good reason to have them. Other times, its pure laziness. I got a fish auto feeder so I can go away for a few days without starving my friends. Sucker requires 2 AAs. There are already 6 other wires, if they just let me plug in a USB C or micro or whatever, it could last forever. Instead, I gotta throw in 2 batteries.

Or like why the hell does my garage opener use a button cell when a AA/AAA would take up like half a centimeter more, last probably 20x longer, and be MUCH easier to replace...