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Battery doesn't even last one day

I just bought a refurbished Forerunner 945. I have followed most of the suggestions for maximizing battery life. Pulse Ox is off. Watch Face doesn't have seconds. I do have heart rate on and activity tracking. But that's all.

I've been getting less than a day from the battery. Overnight it drains alone 40%. I've been having to charge it twice a day.

Is there any seeing I'm missing that could be causing it to drain quickly? I think it may be a defective unit. Does that sound likely?

0 6560664 over 2 years ago

I have then same watch, purchased as a refurb in Dec. i never get 7 days regardless of settings.

i asked Garmin if there was a list of settings to apply to check the battery performance. Support said no. To me this diminishes my trust in the company. As it is, with just generalizations for endurance, endless suggestions for savings settings that require expert knowledge to implement, I can’t understand whether my battery is OK.