Save your battery by closing internet connections that are open in the background. You can do it without closing any apps.
Aeroplane mode closes connections to the mobile connection and switches your device’s wireless features off. Comply with the instructions and safety requirements given by, for example, an airline, and any applicable laws and regulations. Where allowed, you can connect to a Wi-Fi network to, for example, browse the internet or switch Bluetooth sharing on in aeroplane mode.