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You can check your battery health by going to Settings > Battery > Battery Health. The most important indicator there is the Maximum Capacity percentage.

Mine currently says 88%, as you can see in the screenshot below. Yours may say something like 85% or 90%. You should check your Maximum Capacity when your phone is fully charged because it gives the most accurate number. The more you use your iPhone, the smaller this percentage will get.

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When you purchase your iPhone as a brand new device, this number will be 100% or something only slightly less than this. The Maximum Capacity is the biggest indicator as to when you need to change your battery.

Your battery ages but its age is not measured in calendar time like it is as we age.

The more you use your iPhone, the older your battery gets.

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What does Maximum Capacity percentage mean?

Essentially, this percentage indicates how many times your iPhone has gone through recharge cycles. So what is a charge cycle? A charge cycle does not mean that you charged your iPhone from 0% to 100%.

Here is what Apple says:

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