Battery health

barazak Said:

"Battery health: But u know dropping by 1% just in 2-3 days seems strange,while the usage And habits have not changed …."

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All is Fine:

Well, sure it seems strange. But, that's just the way it is. There is no way to determine what the drop occurred.

It's perfectly normal. Batteries degrade over time with usage, that's just how they work. You can expect about a 1% drop per month with average use on an iPhone.

Apple recommends replacing it when it reaches 80%

Here are some tips on maximizing battery life.

https://www.apple.com/batteries/maximizing-performance/

barazak Said:

"Battery health: I own an iphone 12,the battery health was 100 % through 7 and a half months ago ,updated to ios 15, 5 days ago I saw battery health has dropped to 99%, and today it has dropped again by 1%! Now it is 98%,it does not make sense in my opinion ,is it normal?!!!"

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About Battery Degrading:

The Battery Health drops 1-3% out-of-the-box. Why has occurred is normal. Batteries degrade as they are used, eventually depleting (which you should avoid). It cannot stay at 100%. I have had mine replaced a few times, due to high use. I do not use it as much at this moment in time. So, I have not had to replace it in a while.

Unfortunately, there is no way to know how nor when this degrade occurs. Apple recommends that you get a new battery when the Battery Health reaches 80%. So, if the Battery Health is greater than 80%, there is no need to change the battery (yet).