I am following mgmueller's experiment - I think it would be better to check the battery level over equal periods of time.
Switching the device on/off and checking the battery is like four complete screen refreshes. 8" screen refresh takes almost the double of energy needed to refresh a 6" screen, I mean, it takes quite a lot of energy, and apparently introduces by itself extra non-linearity, and then doing that over unequal periods adds some more non-linearity.
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