My iPhone 13 Pro took roughly four months to drop from 83% battery to 82%, and the same again to drop from 82% to 81%. Yet it’s only taken roughly ten days to drop from 81% to 80%, and I wondered if that was normal?
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Is this normal?
- Thread starter super chimp
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Yes it's normal. Battery life isn't linear.
Or it could just be that an update to the BMS and/or battery calibration has been done. My 13 pro went down to 86 fairly fast and stayed there for ages, then went down to 84 and stayed there for long as well.
My 13 pro still had good batterylife on iOS 18.4 before I swapped to a 16 Pro.
So it could be something related to adjustments in the iOS 18.6 update then?
Can u give a proper headline. Thanks
Unlikely. Have a search on here, there are literally hundred of posts on here with people overly concerned with their battery life.
The fact is a battery doesn't have an infinite life, it will age and degrade over time and with use. Just use your phone and don't worry about it.
How to check battery usage on your iPhone or iPad - Apple Support
Learn how to check the amount of battery used by each app on your iPhone or iPad.
Related:
iPhone battery and performance - Apple Support
Understand iPhone performance and its relation to your battery.
If the battery in your iPhone drains too quickly - Apple Support (IS)
"Battery life" is the amount of time that your device works before it needs to be recharged. Battery life is a combination of many factors, such as how much you use your device and which apps you use. Learn what to do if you think your battery is draining too quickly.
It's not an exact number. If you have a Mac that you regularly connect your iPhone to, download CoconutBattery. It will keep a log of the battery health % and it uses more precision and a better algorithm to calculate the estimated battery health %, but even so, it will fluctuate over time. Mine has dropped, then come back up many times over the years I've been watching with the app. No need to micromanage or worry about it, just check occasionally and think about replacing the battery when it gets below 80% or doesn't last as long as you need it to.
Difficult to predict, but I doubt it’s near that point.
I’m still collecting data. However, as a sample, my 6th generation iPad’s battery finally started its plummet <70% state-of-health. When I say plummet, every 1-2 months it would consistently drop ~4% in health.
Typically, a battery degradation will be something like these:
There can be a quick(er) initial drop, then the chemicals stabilize and endurance stays fairly strong, and it finishes with a nosedive.
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IMO what is not normal is attempting to graph one single user's battery percentage 83%, 82%, 81%...
It’s okay to log. Although, indeed, those few data points provide essentially no real conclusions.
coconutBattery doesn’t use an algorithm; it’s simple calculations. Apple’s (i.e., the OS) reported health statistic is more accurate overall, albeit still a best guesstimate. Anyway, again, coconutBattery (and similar utilities) is okay for general monitoring, especially for more precise state-of-charge (i.e., charged percentage) and logging, but not battery state-of-health. Why? Because coconutBattery is primarily just pulling/polling raw data provided by the OS (provided by the power and battery management systems), which is why the values fluctuate so much. Well, actually, the more direct reason the values fluctuate so much is due to the chemical nature of current battery tech.
In other words, coconutBattery is primarily useful for at that moment monitoring, whereas Apple’s calculations are accounting for the long-term, full dataset.
Ultimately, this: