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Turn off LTE (If not in use), Bluetooth and NFC: Bluetooth usually consumes a lot of battery by default if not turned off. But not just Bluetooth, there are other features in the phone which, if turned on might consume lot of battery. Android keeps location-based apps enabled in the background which constantly drain your battery. You can turn off GPS, NFC, Wi-Fi, Bluetooth, and LTE radios. To turn off LTE (if not in use) go to Settings> SIM card and mobile network> turn of VoLTE/LTE. NFC which connects Android phone to Bluetooth speakers and digital cameras should only be turned on when you need it. Some Android phones have an NFC icon in the notification panel itself. Turn of NFC by clicking the Settings > Wireless & networks > NFC.
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Background apps: When you close an app, it just gets suspended for that point of time. The apps is still running in the background and is minimized but not closed. You can however keep a track of ‘Which app is consuming how much power’ with the inbuilt battery monitor. All you need to do is Go to Settings > Battery and you'll be able to see which apps are running in background and which consumes more power which in-turn will help you save battery.