Iphone 8 plus Battery already at 97% health after 1 month

I just recently bought a brand new Iphone 8 plus from apple. I ‘ve only been using it for 1 month but already shows that my battery has deteriorated by 3%. I take care of my battery really well, and I question the accuracy of their battery percentage health (beta). Is this new ios 11.3 feature accurate?

Posted on Apr 15, 2018 8:13 AM

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16 replies

May 3, 2018 8:55 PM in response to diodes123

diodes123 wrote:


If you use your phone a lot, use it until its 100% dead, and then charge it to 100%, you are putting a TON of stress on your battery, and that will make it deteriorate very very quickly.

If you take good care of your battery, call apple or take it to an apple store. Your battery might be defective, in witch case, Apple should replace for free.


Apple isn't going to consider an iPhone battery "defective" until it reaches 80% battery health (unless it's above 500 cycles) or completely fails during the warranty or AppleCare+ period. The battery is considered "normal" as long as it's above 80% battery health, even if it seems like there's a rapid decline.


As far as using the entire range of charge, there are various opinions on that. However, Apple neither recommends for nor cautions against using an iPhone battery down to 0%. 0% is considered normal operating conditions as long as it's charged again before it self-discharges to a deep discharge state.

Jul 26, 2018 6:46 AM in response to Claroie101

I was having the exactly same issue, just bought my Iphone a month ago and it was showing 97% of health. I found it very weird, since some people who bought it 6 months ago and the battery is still at 100%, so I took mine to an applestore and there they´ve ran those tests to see if the Iphone was OK. This test said that there was some kind of audio failure, maybe this failure is causing this battery degradation, since Apple employee said that he had this same problem on other Iphone 8 plus. I´ll let you guys up to date, on whether or not did apple replace my Iphone.

May 3, 2018 4:23 PM in response to Claroie101

It's the same battery health that would show up with an official hardware/software diagnostic.


That being said, it's only an estimate. Some have reported it's gone up a percent before. Determining degradation of a battery isn't like measuring the volume of liquid in a fuel tank. It's estimated based on mathematical models. All they can do is sample the conditions in real time and take a good guess as to how much capacity is left. Especially with older batteries that have been through a lot of use, that estimate can be way off. A lot of people report that older batteries often drop quickly from maybe 60% to 20% remaining charge, and that's probably because the battery health estimate is off and the battery management comes to the sudden realization that there's less charge than anticipated.


And there's probably way too much obsessing over this number. Loss of original battery capacity is inevitable from simply using the battery. Apple says for newer iPhones it's 500 charge-discharge cycles until it's expected to be at 80% battery health. If there's 300 cycles a year for someone who uses the phone a lot, assuming a linear degradation it's expected to be a loss of 1% a month.


There might be some ways to exponentially increase the longevity of the battery, but that seems really obsessive when it comes to a battery that Apple is currently charging $29 to replace.

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Iphone 8 plus Battery already at 97% health after 1 month

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