The keypad for the garage door opener didn’t cooperate one cold evening, so the first thing to check is the battery:
Given that it lacks a scrawled date, it’s the original battery dating back to late 1998 when I replaced the defunct opener that Came With The House™.
It was down to 8.3 V on that sunny afternoon and, surely, not nearly enough in the dark of a wintry night.
Even I can’t complain about that kind of battery life …
The Smell of Molten Projects in the Morning 