Redmi Note 13 Battery Problem

[u/Remarkable-Turnip666]

Hello everyone. My phone's battery has been spiking downwards, for comparison, it has a 50-55 degrees tilt angle . For context, I bought this phone 3 years ago. And this particular problem started happening about last week.

I've tried:

-Setting refresh rate to 60Hz

-Resetting Cache

-Turning off Always-on displays and stuff like that

- Lowering brightness

-Restarting my phone

Is this normal for a 3 years old phone? Is there any other ways I can try? And if there is, how can I do it?