Hello Ahmetrsahin,
Welcome to Apple Support Communities!
We want to help you get the most from your AirPods.
It's expected for them to charge when they are in the case. Detailed here: "Charge your AirPods
To charge your AirPods, put them in your case. Your case holds multiple, full charges for your AirPods, so you can charge on the go. To keep your AirPods charged, put them in the case when you're not using them."
This Apple Support page has the full details: Charge your AirPods and learn about battery life - Apple Support
This will help ensure the AirPods are charged and ready for you to use them next.
Cheers!