[lloeki]

> hold a charge for several days

That would be an understatement, are you running/cycling a lot outside, or is it a smaller model (thus small battery because physics)?

Mine (Fenix 7) holds charge for 15 days minimum and that's with tracking workouts 3-5x/week (no GPS though, winter so I treadmill for runs). On a couple of months where I didn't do sports it held up 25-30 days.

I have SpO2 tracking disabled because it's quite battery intensive and the only use for it would be high altitude acclimation, although I must admit I looked at it during my "stop smoking" process.