1. Black wallpaper can save battery
If your phone has an AMOLED screen (like most Samsung devices), use a dark-colored background. Because AMOLED screens only illuminate the colored pixels. Black pixels are unlit, so the more black pixels you have, or the more darker pixels, the less power is needed to light them up.
2. Doze
With the arrival of Marshmallow comes a new feature called Doze, which helps you get more out of your device's battery. Along with Google Now on Tap, Doze is the most notable addition to Marshmallow. It is enabled by default and essentially allows your device to enter hibernation mode when it has been sat unused for a prolonged period of time.
The effect of this is that your phone now sleeps when you sleep, and will lose just 3-5 percent of its battery power during and average night, rather than up to a quarter, as it would have done without Doze.
Apps are not obliged to use Doze, and you can view which ones use it and which don't in Settings and edit the list if you want to.
In addition, Sony has said it's planning to incorporate its own enhanced stamina mode into Marshmallow for its Xperia range.
3. Don't use adaptive/auto brightness
Don't use display auto-brightness. It may sound useful, but auto-brightness is usually way brighter than you really need. It's better to manually set the brightness to a level that is low but comfortable, and bump it up when necessary. This is one of the best ways to improve your battery life, because the screen is one of the biggest battery suckers.
4. A shorter screen timeout setting saves battery
Set your display's screen timeout to as short a time as is practical for you. Just think, if your screen timeout is set to a minute, it'll use four times more power than if it were set to 15 seconds.
Studies report the average smartphone user turns their smartphone on 150 times a day, so the difference between a long screen timeout and short one soon adds up. Reducing it will help keep your battery running for longer.
5. Your phone doesn't have to be smart all the time
Turn off smart features like air gestures and smart scrolling, especially if you have a Samsung. Unless you really use these features every day, they're just using battery power for no reason
6. Turn off vibrate and haptic feedback to save battery
Switch off vibrate. Unless you really need that added awareness, turn off vibration alerts for incoming calls. It actually takes more power to vibrate your phone than it does to ring it. Turn off haptic feedback too (that buzz you get from typing on the keyboard). Sure it feels cool, but it doesn't really add anything to your experience, and it's another battery drainer.
7. Use lock screen notifications
Lock screen notifications can also help save you battery life, especially if your phone has an AMOLED screen. This is because you can see your notifications at a glance without having to turn your whole screen on. This is especially useful if you get lots of notifications that aren't worth following up on immediately. Lock screen notifications come standard on Android Lollipop.
If you're using Android KitKat, try using lock screen widgets or notifications if your ROM supports them, or install an app that does it for you like Dynamic Notifications. You'll be able to get basically all your content without having to unlock your phone fully and navigating around. You'll still need to light your whole screen up, but you'll have it on for much less time than normal.
8. You don't need to be connected 24/7
Turn off GPS, Bluetooth, NFC, Wi-Fi and mobile data whenever you don't need them. Turning off location data, or changing your Location settings to use Wi-Fi or 3G data rather than GPS works perfectly well.
Only turn on Bluetooth and NFC as long as you need them (even though they consume very little power), and there's no need to have both Wi-Fi and mobile data turned on at all times, especially if you know exactly when you'll need one or the other.
If you use Wi-Fi a lot though, say at home and at work, then it makes sense to keep set your Wi-Fi to 'Always on during sleep' as this uses less power than to have your Wi-Fi reconnecting every time you wake your phone.
NOTE:- WHILE CHARGING UR PHONE PUT IT ON FLIGHT MODE FOR FASTER CHARGING
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