What Affects the Life of a Phone Battery?
Whether you're running an iPhone or an Android device, the factors that affect battery life are more or less the same.
By far, the biggest drain on your phone's power is the screen, particularly with today's larger and brighter displays. You can reduce the energy needed by dimming your screen's default brightness, either by hand or automatically using the power-saving features built into your phone.
Change the screen time out (also called auto lock) to its shortest setting, so that the screen is activated as little as possible. Also, try choosing a dark theme instead of a bright one. The less white you have in your display, the less battery juice it will need.
Turn off unneeded radio functions such as Bluetooth, NFC, and even Wi-Fi if you're not connected to a network.
Finally, deactivate or uninstall busy apps which you don't really need on your phone. Only allow your most important apps to run at all times in order to keep background activity as low as possible.