As per your concern, we would request you to kindly perform the following steps to resolve your issue.
Charge in one go instead of charging many times as it affects the life span of the battery and battery performance
Perform Battery Optimization Battery optimization helps you to boost the battery performance of your device. To check battery optimization: Settings > Select Device Maintenance/Device Care/Battery and device care > Optimize > Optimize all options like Battery, Storage, and Memory
Turn off Wi-Fi, GPS, Bluetooth, etc. Turn off unused functions like Wi-Fi, GPS, Bluetooth, and location settings when not using them: On the home screen swipe down the notification panel > Turn off Wi-Fi, GPS, Bluetooth, and other connectivity features when not using them.
Check device network fluctuation Kindly check whether the mobile network fluctuates frequently or if the network signal is low in your area. In both cases, the battery will drain considerably fast. Recommendation: We recommend you avoid using it in areas with low network/fluctuation.
Reduce display brightness level Kindly set the device display brightness in auto mode (If available). Adjust screen timeout settings: Settings > Display > Screen timeout > Select minimum screen timeout.
Check and update the App: Kindly check which application or interface is using more battery from device care. And try to update the app or avoid using that app.
Close background running apps Close all the background running apps when not using them,
Turn off auto sync of e-mails, app data, etc. We request you turn off the auto sync option, it will stop the synchronization of the device with the server & reduce the battery drainage. The steps to turn off auto sync are: 1. Swipe down on the home screen to open the notification panel. 2. Turn off the auto sync option. Check your device in safe mode: https://www.samsung.com/in/support/mobile-devices/safe-mode-on-samsung-phones/
In case the issue still occurs kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
