“Battery lifespan” is the amount of time your battery lasts before it kise goodbye.
Your phone display is the highest default consumer of battery that you have closely following running heavy applications ofcourse.
There are two simple ways you can preserve battery life — no matter how you use your device: adjust your screen brightness and use Wi-Fi.
Optimize your settings
Dim the screen or turn on Auto-Brightness to extend battery life.
• To dim, swipe up from the bottom of any screen to open Control Center and drag the Brightness slider to the left.
• Auto-Brightness adjusts your screen to lighting conditions automatically. To activate it, go to Settings > Display & Brightness and set Auto-Brightness to On.
When you use your device to access data, a Wi-Fi connection uses less power than a cellular network — so keep Wi-Fi on at all times. There are two ways to turn on Wi-Fi:
• Swipe up to open Control Center, tap the Wi-Fi icon, and log in to a Wi-Fi network.
• Go to Settings > Wi-Fi to access a Wi-Fi network.