Afraid it's true. The mouse says it's a Logitech M185 and runs on a single AA. The keyboard is a K270 and uses 2 AAAs (I think, I taped the battery door shut since it kept falling off). I got them along with my work laptop when I started my current job five years ago, and I've only had to change them once each.

I think I may have also replaced mouse or keyboard or both a while back, with identical models, so call that two battery changes in five years, if you want to be conservative. Maybe it helps that they're disposable instead of rechargeable.