Better than rewinding the film and changing cartridges every 36 shot.
Or changing roll film every 12 or 24 shots.
Hint from the past: When the battery meter first hits the last segment, take the next predictable lull in activity to change it.
What you just shared is a good dose of wisdom. Had you read what others shared about shorter battery life leading to not capturing a moment? They could just as easily lose a special moment with double battery life if they wait for batteries to go dead.
In a previous post, I mentioned reading about a grip for the EOS R. In this video, the man appears to have one attached.