Why did my iphone 12 pro battery draining fast ?

Hello jayal0709,

We would like to see how we can help you with your battery life. Can you go to Settings > Battery, then tap on Show Activity just below the graph of your battery usage? Once you've done so, you can determine what apps are using up the most battery. For more tips on getting the most out of your battery life: Maximizing Battery Life and Lifespan

Cheers!