There are many ways to save the battery life of any android phones.
Brightness:
Always use as low brightness as you can. This is highly recommended as high brightness produces more light out of your phone’s screen and stresses the battery and results in battery drain. Better use Auto- Brightness mode to change the brightness automatically based on day or night.
Screen Time-out:
Mostly use minimum screen time-out. Sometimes when you’re done using your Android device, the screen remains on for a duration of 30 seconds or more. You can set this time-out to the minimum available time and unstress your device’s battery.
Wallpaper:
Mostly use dark background to battery consumption. Always use a static wallpaper. That means you got to avoid Live wallpapers on your Android smartphone.
Turn off Auto – Sync:
Auto-Sync consumes your smartphone’s battery to the worst extent. Basically this feature keeps on checking all your synced accounts with your cloud storage or with your gmail / email and other such services and displays / updates the missing data. Disabling Auto-Sync may save your battery a life.
Turn of NFC & Bluetooth:
Keeping NFC and Bluetooth and other such wireless connectivity options is a lot helpful as well. NFC uses your phone’s screen and results in consuming the battery, similarly Bluetooth stresses the system as well and eats a lot of battery.
Turn of Mobile Data:
Believe me or not, Mobile Data eats more battery then the WiFi. You may use Mobile data only when it’s needed otherwise it will definitely result in battery drain.
Charge Your Device’s Properly:
Charge your Android device properly and carefully always. Do not wait for the battery to drain to 0%. Always plug the charger in as soon as your device falls to 50%. This will help the battery life cycles, and help the battery to remain efficient.
Always Use Correct Charger:
Always use the correct charger to charge your Android device. Do not use a charger with invalid voltages, or invalid power to charge your device. You may use a slow charger for this purpose when you’ve time, specially when you’re sleeping.