iphone 15 battery healt drop

You can expect Battery Health to decline on average at about 1% a month. So, after 2 month, the battery is going to be at about 98%. So, things are normal.

But, that 1% a month is an average. Some months it might not decline at all, then drop 2% the next month.

When the Battery Health is down to 80% about 18 months from now, it will be time to replace the battery.

That is perfectly normal.

Batteries degrade over time with usage due to chemical aging, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

iPhone Battery Replacement.

iPhone Battery Repair & Replacement - Apple Support

About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

Here are some tips on maximizing battery life.

Batteries - Maximizing Performance - Apple