Iphone 12 Maximum capacity battery 98% in 4month

Batteries, ALL BATTERIES with every full cycle charge, lose their ability to hold the same charge as new. It's normal. And a 2% reduction in battery health in 4 months is not cause for concern. When Battery Health dips to 80% or less, which in the future it surely will, it will then be time to pay to have a new battery put in your iPhone. Until that day, stop worrying about something which is normal and cannot be stopped.

Loss of battery capacity is inevitable. 98% isn't bad after 4 months. Also, don't get alarmed if you see it parked at one value for months, and then it drops 3% seemingly overnight. When it updates is unpredictable.

That's great! On average you can expect a decrease of 1-2 percent per month.