Now, you know that by default, each notification you receive will pop up on your lock screen, lighting up the display of your iOS device and prompting you to view it. That’s nice and all, but waking up the phone and powering up the screen for each and every notification is a recipe for disaster for your battery life. That’s not good, not good at all!
The less apps are allowed to actively show you your notifications, the less time your display is awake, resulting in an improved battery life. Lucky for us all, you are allowed to customize your notifications and select what apps can display notifications on your lock screen and wake up the phone. In order to do so, head to Settings > Notifications, select a given app and disable the «Show on Lock Screen» option. This will stop your phone from having its display turned on by said app, potentially saving you some battery.
In case you wish to stop all notifications altogether, head to your Do Not Disturb settings and set Silence to «Always».