Can calculator batteries last for 30+ years?

[DavidNRockies]

Just an FYI … because I think these stories are quite cool:

EPIC battery life - any similar stories?

I have the exact same digital multimeter that’s pictured at the bottom of this photo: [image] I’m sure I’ve had it for 20 years. I’m just about sure I’ve had it for 25. And I’ve never changed the battery. It sat in a small tool kit for the last ten years … a kit that used to live in an old car of mine, and that I left at my brother’s house and forgot about. My wife was visiting my brother and his family over the weekend, and – having inexplicably suddenly…