For me, the computer towers are across the room so I use cheap wireless battery mice and a nice wireless keyboard. I use rechargeable AA for the mice, and they last a pretty decent amount of time. I had a lot of rechargeable AA and AAA already. The keyboard has built in rechargeable battery and can swap inputs with a button press so I just have the one for the towers. If I turned off the backlight it would hardly ever need charging, but since I like the light, it needs a charge every few days of actual use.

For my laptop, which isn’t across the room, I still use a wireless mouse because I just have them. I can also have one mouse tethered to two dongles and use the same device for two PCs that I don’t have on at the same time, so I do that between the laptop and the gaming pc.