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How to calibrate battery indicator of Edge 820 after battery replacement?

I purchased new battery and replaced it.

But the battery level indicator is not linear. 

For example, I rode for 2 hours and battery drain is 16% (100% -> 84%)

I have another 2 hours ride, but battery drain is 1% (3% -> 2%).

Please note, that all settings and sensors still the same in the both cases.

I tried to discharge the device fully and then charge to full, but it didn't help.

May be there are some instructions or system menu for such cases?