Thanks for reaching out, Sadu.turi.
It sounds like you're noticing the battery is being used faster in one AirPod Pro than the other. We can help.
Check out this information on how to Charge your AirPods and learn about battery life:
What you can expect with AirPods Pro:
With multiple charges in your case, you get more than 24 hours of listening time, or more than 18 hours of talk time.
Your AirPods Pro can get up to 4.5 hours of listening time or up to 3.5 hours of talk time on a single charge.
If you charge your AirPods Pro for 5 minutes in their case, you get around 1 hour of listening time or around 1 hour of talk time.
If you're noticing one AirPod is draining slightly faster, consider that this could be due to the additional charge that the usage of the microphone requires. If you're noticing a substantial drain, there might be a hardware cause, and you can Contact Apple for support and service if needed.
Hope that helps.
Take care.