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I have been buying my iPhone 11 in a very short time. But within 1 month my battery life has come down to 94%. What do I do now?

I have been buying my iPhone 11 in a very short time. But within 1 month my battery life has come down to 94%. What do I do now?

Posted on Dec 1, 2021 1:19 PM

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Question marked as Apple recommended

So you have a 1 year old phone and it’s maximum capacity is 94%. That is excellent; most phones would be at 88% after a year. 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”. 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 other thing to keep in mind that a battery is a chemical device, and chemistry is generally pretty variable and uncertain, as well as being analog, not digital. Apple specs the battery capacity to remain above 80% for 500 full charge cycles, but that is a minimum requirement; there is no published maximum expected capacity. So sometimes batteries will perform much better than that minimum specification, and sometimes the change in maximum capacity won't be linear.

Posted on Dec 2, 2021 8:21 AM

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Question marked as Apple recommended

Dec 2, 2021 8:21 AM in response to riyad194

So you have a 1 year old phone and it’s maximum capacity is 94%. That is excellent; most phones would be at 88% after a year. 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”. 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 other thing to keep in mind that a battery is a chemical device, and chemistry is generally pretty variable and uncertain, as well as being analog, not digital. Apple specs the battery capacity to remain above 80% for 500 full charge cycles, but that is a minimum requirement; there is no published maximum expected capacity. So sometimes batteries will perform much better than that minimum specification, and sometimes the change in maximum capacity won't be linear.

I have been buying my iPhone 11 in a very short time. But within 1 month my battery life has come down to 94%. What do I do now?

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