Garmin edge 820 - Battery draining very quickly

I am using the Garmin edge 820 as my head unit. I only have my power and heart rate sensor connected to it. I also selected the GPS mode instead of the GPS + GLONASS mode, and set the display brightness to 10%.

Starting at 100% battery level, the battery life drops to ~40% after a 3 hour ride. What can I do to maximize the battery life without shutting down the display?

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Following with interest as this subject came up on today’s ride as my friend is having the same problem with his 820.

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On this year’s first long ride (4h+) my 820 got into power saving at 3.5h. I didn’t expect that. Now I just bring a power bank taped to the top tube on my longer rides.