iPhone 15 128GB battery drains really fast
Hello,
My new iPhone 15 128GB battery drains really fast,the battery condition is 100% and i have the phone since last friday (22.09). The battery is very bad, i can’t even get outside the house without the charger. My friend that has a simillar but older iPhone 14 from september 2022 says that the battery in her phone is very good and lasts for one whole day. What is causing my problem? My iPhone runs the newest iOS 17.0.2. Please help