Hi there, kindly help us with the following information to find a solution to your query.
firmware version your device is currently on.
share the SOT (Screen on Time) after trying the below:
i. Charge the battery to 100% & use as per your normal usage pattern
ii. When the battery strength reaches 10%, go to settings = Battery => Tap on the battery icon & share the graph
iii. settings => Battery => Check the screen & share the same
Also, please follow below steps may improve battery backup:
1. Close apps that are not used (Bluetooth, WiFi, GPS, etc.)
2. Adjust sleep time and brightness (Settings > Display)
3. Boost memory when you see memory consumption is high with no app running,
4. check for background running applications, stop/disable unwanted apps, you can manage apps from auto-start manager.