I had a GoPro Hero 7 and 8. In the -10c snow they battery wouldn't even last for 5 minutes. It's a bad product and just like with cars and solar the Chinese are ruthlessly out-engineering the west.
I had the same problem with (I think) a Hero 3 over a decade ago; given snow sports is a key use case, this is poor.
TheOutdoorBoys youtube channel mentioned something about special batteries for cold temps. -10c for many of his hiking and camping trips isn't unusual, and (as I understand it) he did weekly videos with Go Pros for a decade. He probably knows a thing or two.
This is true. They sell special "winter batteries" now. What a poor decision...
I never understood if I was supposed to turn it completely off on the ski lifts or leave it in “sleep” for best battery life, and like you say the battery in the cold was just disappointing. Some irony though with another HN commenter having an overheating issue.