How to save smartphone charge if you have to be sheltered or without light for a long time

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Tips for those with an iPhone:

• set a dark background “wallpaper”, reduce the screen lock time, brightness, turn off the sound;
• turn off the programs, applications that you do not use;
• turn off the Internet when you do not use it;
• turn on the mode “Do not disturb” or “Avia”;
• turn off iCloud, Wi-Fi and Bluetooth, Siri and visual effects, and geolocation;
  turn off physical activity tracking.

Tips for Android smartphone owners:

• turn off Wi-Fi and Bluetooth;
• set a dark wallpaper, reduce screen brightness and enable automatic screen brightness adjustment, reduce standby time;
• turn off apps , which you do not use, but they run in the background, limit the operation of applications that require a lot of battery;
• delete accounts from the device that you do not use;
• enable “economy mode charge” or adaptive consumption;
  turn off geolocation.