I have a headtorch like this. Keep it charged and most of the time everything is good. But that one time when I’m out skiing at night and shit goes wrong / I run out of charge it’s OK because I have a couple of AA’s in my bag as spares.

Assassins creed: valhalla for the big stints.
And knights of tight spaces for when I think it’s a short stint and ends up playing it for a few hours.

The one on the right are for users of these