iPhone X Maximum Battery Capacity dropped 2% in 3 weeks, how?

MK25toLife

macrumors regular
Original poster
Aug 7, 2007
240
1
Hello, I bought a like new iPhone X on Sept. 18th and the Maximum Capacity at the time was 100%. Today, I checked it and it was at 98%. My avg. screen on time is 5hrs 51mins a day and avg. screen off is 1hr 3mins. It's quite hard to believe my screen is on almost 6 hours a day. I work full time and while I do check it quite often I have a hard time seeing how it adds up to 6 hours a day.

Any thoughts? Is my avg. screen on time in the 99th percentile or something? Is that why my battery capacity dropped so quickly?
 

AppleHaterLover

macrumors 68020
Jun 15, 2018
2,036
2,040
I'm quite addicted to my phone as well.

Here's some factors for you to consider:

1) Battery degradation is not linear
2) Battery Health is in beta
3) If you're not seeing any strange behavior or reduced battery life, you should be fine.

I got my phone in February, with very heavy usage the battery is now at 90% (and it dropped from 92% to 90% int he past two weeks or so). Sad but welcome to real life, batteries are consumables. If/when battery life becomes an issue, replace the battery.
 

SoYoung

macrumors 6502a
Jul 3, 2015
972
436
My iPhone 6s plus quickly degrade to 90% capacity and after 2 years and a half, battery capacity is at 84%. It will be stable at some point. The phones are made to hold 80% capacity after 2 years at least,
 

smirking

macrumors 68030
Aug 31, 2003
2,626
2,288
Silicon Valley
Batteries will do that. Battery health is just an estimate. I doesn't matter if it's beta or not. When it was saying 100%, it might not have actually been at 100% just as it might not actually be 98% right now.

I don't pay attention to my iPhone battery as much so I'll use my 2016 MBP as an example.

1-25-17: 102% (first reading)
6-14-17: 100%
10-13-17: 96%
11-29-17: 93%
12-21-17: 95%
5-7-18: 90%
9-9-18: 82%
right now: 86%

I don't know how the iPhone's battery app is calibrated, but Coconut Battery actually shows my MBP gaining battery life after it lost some of it. I doubt that actually happened. It's just coming up with different estimates. I'd only worry if your percentage drops fast and keeps dropping for weeks and months without stabilizing or you start having performance issues related to power.
 
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Renho

macrumors 68000
Sep 15, 2014
1,869
601
SR, CA
I'm quite addicted to my phone as well.

Here's some factors for you to consider:

1) Battery degradation is not linear
2) Battery Health is in beta
3) If you're not seeing any strange behavior or reduced battery life, you should be fine.

I got my phone in February, with very heavy usage the battery is now at 90% (and it dropped from 92% to 90% int he past two weeks or so). Sad but welcome to real life, batteries are consumables. If/when battery life becomes an issue, replace the battery.
I think battery health is out of beta now
 

smirking

macrumors 68030
Aug 31, 2003
2,626
2,288
Silicon Valley
My iPhone 6s plus quickly degrade to 90% capacity and after 2 years and a half, battery capacity is at 84%. It will be stable at some point. The phones are made to hold 80% capacity after 2 years at least,
I always tell people not to freak out about their battery, but what you described would have freaked me out. I've had a number of battery related issues (all with laptops) before. Batteries are just not entirely predictable. You can get ones that steadily decay and keep decaying slowly and others that seem to retain their health for an impossibly long time only to become entirely unstable and unusable.
 
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