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I’ve bought a slightly used iphone 11 a month ago its battery health dropped from 86% to 84% is it normal?

Hi The Battery health percentage is Normal drop from time to time as battery degrade through the years to come and depending on your usage and how you charge your phone . Once the Battery reaches below a Percentage of the health it will show in that section that the battery has degraded and that it requires changing and to take it to an apple service provider. Thanks