There are several reasons due to which you're experiencing battery draining issues with your MacBook Pro. Here are some steps that you can try to resolve the problem:
1. Check your Energy Saver settings: Go to System Preferences > Energy Saver and make sure that the settings are optimized for battery life. You can adjust the settings for "Battery" and "Power Adapter" separately, and ensure that the "Put hard disks to sleep when possible" option is checked.
2. Reset the SMC (System Management Controller): Shut down your MacBook Pro, and then press and hold the Shift + Control + Option + Power button for 10 seconds. Release all the keys, and then press the power button to turn it back on.
3. Check for software updates: Make sure that your MacBook Pro is running the latest version of macOS and that all your apps are up to date. Go to the App Store and click on "Updates" to check for any pending updates.
4. Disable unnecessary background processes: Close any unnecessary apps and background processes that may be consuming battery life. You can also try quitting apps that you're not currently using by using the Command + Q shortcut.
5. Check for any third-party software conflicts: Some third-party software or applications may cause battery drain issues. Try uninstalling any recently installed third-party apps to see if the issue is resolved.
6. Run diagnostics: Use Apple Diagnostics to check if there are any hardware issues that may be causing the battery drain. To do this, shut down your MacBook Pro, then turn it back on and immediately press and hold the D key until the diagnostics test starts.
If none of these steps resolve the issue, it's recommended that you contact Apple Support for further assistance or take your MacBook Pro to an authorized Apple service center.