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theflatboy
I get between 7 and 10% per hour. I never put screen brightness higher than 50% as it is not needed (for me). Screen is even too bright in the dark, I sideloaded an app to lower the brightness even more. My active sensors are HR and Di2.
So 10 hour rides are possible but when I go +8 hours I always take a powerbank just in case. Did it with my garmin and wahoo as well. Ease of mind.