Battery health dropped to 99% on 2 months 5 days usage

Hello,

Depending on usage, that is normal and is nothing to worry about. Generally, Apple will replace the battery under warranty if the battery health falls below 80% during the first year.

See this link by Lawrence Finch for some battery charging tips:

When to charge your iPhone or iPad

Good luck.

And? Not allowing it to fully charge then means you’re accumulating cycles. That’s the number one cause of battery capacity decline. If you allow it to fully charge then it will stop charging and stop actively using the battery while it’s fully charged (or held off in optimized charging mode) and connected to external power.