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Fenix 5 APAC - battery goes to 4% everytime I start any activity (v20.10)

I have a Fenix 5 APAC for a while now. Battery life is usually pretty good and lasts around a week with no activities.

For the last week or so, I've noticed that even after full charge, when I start any activity (e.g. treadmill run) the battery immediately drains to around 4 percent. This is making the watch basically unusable for any exercise. I've done a software reset, I don't have any custom watch faces or widgets (besides the battery measurement one that I installed after this problem started)

Has anyone else had these problems? I'm on v20.10.