See this question in the wiki:
There is also a power monitoring app that will show you how much power is being used and writes to a log. But the answer in the wiki covers most of the big power drainers.
I used to only get 3 days as I was constantly flashing new versions of code onto the watch. But I have eased off developing so much and most often get 2 weeks. This drops to about 1 week to 10 days if I start using the heart rate monitor with a setting of 3 mins. I definitely would say set heart rate to every 10 minutes or off. If you use a clock that supports clock_info you can always tap the heart rate clock_info to get a refresh.
I think I get about 20+ days on my 2nd Bangle2 which has HRM off and just stays mostly in a drawer.
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