Is it normal for my new iPhone 15 to drop to 99% Battery Health?

I have charged my phone 25 times and battery health has been dropped to 99 percent.

You will drive yourself crazy if you are checking the battery all the time.

Why?......due to the special way that Apple displays percentages, they always round down the real percentage to only a two digit number.

So, your battery might really be at 99.9%.......but this will be displayed as 99%. What looks like a 1% decline might really only be a .1% decline, or other small amount.

All that you really need to do is remember to replace the battery when it is down to 80%, although you will get an on-screen notice when that occurs as well.

Expect 4-5 years of use on the battery.

The battery life is about 1000 cycles it shouldn’t be dropping too fast then again it depends on the user