Apple gives you access to very specific information about your battery. You can check them yourself by going to Settings> Battery, and you can find more information by clicking on Battery Status.
But your iPhone is collecting a lot more information about your battery.
But Apple doesn’t give you easy access to this information.
They are buried in your iPhone. Buried very deeply.
To find this information, you need to go to Settings> Privacy, then scroll to the bottom and tap on Analytics> Enhancements.
Then you need to click on Analytics Data. This setting only exists if you have enabled the Share iPhone Analytics feature (or Share iPhone> Watch Analytics). If it’s not on, you’ll have to turn it on and wait a day or two for the iPhone to collect the data.
Yes, the information is only saved if you choose to share it with Apple. But interestingly, Apple doesn’t allow you to take a quick look at it.
If Analytics is on, tap on it and you’ll see what looks like a wall of files.
No panic! You must scroll through the files until you find a file that begins with the name log-aggregation. There are likely several with dates in the name.
The most recent will be at the bottom of the list. Tap to open it and it will be full of information. And that’s a lot of information.
In the aggregation file.
And reviewing that data on the iPhone itself is a tedious task (although it is possible if you are patient and copy and paste into an app like Notes).
What I do is hit the Share button and email the file to myself so I can open it at will on a Mac or PC (you can always have it sent to yourself by AirDrop).
E-mailing me the file
The file contains a lot of information, so once you open it in a text editor, you can start looking for specific information.
First of all, if you search for BatteryCycleCount, you will know how many charge cycles your battery has undergone. According to Apple, your battery should retain 80% of its capacity after 500 charge cycles, so have access to this figure.
This is probably the most important number that Apple does not share with you.
But there is more.
Another measurement is MaximumFCC, which refers to the maximum capacity of your battery when new, measured in mAH (milliAmpHour). Apple prints a nominal capacity on its batteries, but this is a theoretical number and the actual capacity varies.
The number you will get in the log file will be the maximum capacity of your battery as measured by the iPhone.
The MaximumFCC will almost always be a few percent higher than the battery’s rated capacity. This explains why the battery does not start to lose its health from day one.
Another number that you can get from the logs is the Nominal Charge Capacity, which gives you the current capacity of your iPhone battery. This is the current capacity of your iPhone battery. Remeasured in mAH.
This gives an indication of the state of battery wear.
Can you do anything to reduce battery drain? Not really.
Your battery will lose approximately one percentage point every 25 cycles (note that you may not notice this immediately because the actual or maximum FCC capacity of the battery is greater than the nominal capacity), so apart from using less your iPhone, there is not much you can do.
However, you can reduce premature battery wear by keeping it within its rated temperature range and avoiding overcharging.
The iOS feature called Optimized Battery Charging helps prevent premature battery drain when overcharged.
But note that I said “premature battery drain”. It does nothing for normal battery wear. You cannot change the laws of physics.
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