Daiso had both alkaline and traditional carbon-zinc batteries in this size. I chose the latter because it’s for a 1960s device and I think that was the default battery chemistry in the era, plus modern alkaline batteries seem very prone to leaking when left alone for 10 years.
It’s got one of those sensors opens and closes automatically. It has survived a bunch of non-dull things and it’s probably the most useful thing I kept through relationships, step kids, and times of too much excitement.
I can’t go into it as much as I want, but I do love the fact that it just works on two D cells every few years. That trash can makes me happy.