I did a clean reset of my old 520 yesterday and afterwards i ran it sitting on my desk with GPS on and auto-pause off. After 7.5 hrs, it was down the 47% remaining which i thought was quite good (7% per hour and theoretical 14hrs life)
Today i did a ride of 3'32" moving time and 4"36" elapsed time (Coffee!). It was down to 58% remaining which makes it around 9% per hour drain on elapsed time, or around 11hrs theoretical life
The only difference was it was connected to my HR belt and Power Meter and the screen had less fields on it
Either way, the battery life was better than i expected
Brightness was 0%, backlight timeout was 15s, and data recording 1s, bluetooth off, all unused sensors disabled, GPS & Glosnass on, only one data screen was enabled
The questions are
Do enabled data screens that are not being viewed drain battery? Given the data is instantly available when you switch to them (i.e. mapping), i wonder if they are draining the battery in the background
Do calculated fields (like Power 10s, 30s etc....) drain battery more than raw data fields like cadence, heart rate etc...?
Anything else i can do to eek out more life from the battery other than changing data recording to averaging or using GPS only (neither of which i want to do)
Thanks
