Iphone 15 plus battery health

The battery will normally decline about 1% for every 25 charge cycles.

You have had 33 charge cycles, so 33 divided by 25 = 1.3%.

So, the battery has probably only declined by 1.3% to 98.7%. But, Apple will round 98.7% down to 98%.

You are spending way too much time worrying about your battery. When Battery Health is down to 80%, it will be time to replace the battery.

aalaaf_006 wrote:

My phone is only a month old

and battery health dropped by 2% in 33 charge cycles

Seems normal.

Maximizing Battery Life and Lifespan

Batteries - Maximizing Performance - Apple

About Optimized Battery Charging on your iPhone

About Optimized Battery Charging on your iPhone - Apple Support

≤ 80% maximum capacity is when Apple suggests the battery is eligible for replacement