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why is my battery health percentage decreasing ?

Why is my battery health percentage decreasing ?

iPhone 11

Posted on Jul 21, 2021 1:07 PM

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Question marked as Top-ranking reply

Posted on Jul 21, 2021 1:19 PM

Battery Health is an inexact figure and varies with usage. You need not worry until it reaches 80%, at which time you will need to make an appointment at the nearest Apple Store for a battery replacement. Check this link and the one that you have already found...

https://www.apple.com/batteries/maximizing-performance/

4 replies
Question marked as Top-ranking reply

Jul 21, 2021 1:19 PM in response to Mieksie

Battery Health is an inexact figure and varies with usage. You need not worry until it reaches 80%, at which time you will need to make an appointment at the nearest Apple Store for a battery replacement. Check this link and the one that you have already found...

https://www.apple.com/batteries/maximizing-performance/

Jul 21, 2021 1:31 PM in response to Mieksie

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles” ( some will be a little more, others a little less). As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.


The absolute best way to improve the life of your battery long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern.

why is my battery health percentage decreasing ?

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