Start by checking Settings → Battery to see which apps are using the most power, then restrict background activity for apps you rarely use.
Lower screen brightness, shorten the screen timeout, disable GPS/Bluetooth/mobile data when unnecessary, and use Battery Saver when you need longer battery life.
Also check for system and app updates, as software issues can sometimes increase battery consumption.
If the battery still drains unusually quickly, especially when the phone is idle or becomes hot, contact itel support or an authorized service center to have the battery and charging system inspected.
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