I have just read an article on Bussiness Insider about how to charge the phone and tablet properly. It's embarrassing when I thought I've always been charging the phone in the right way but I actually was wrong. Please check if you have done it corectly :)
1. Charge whenever possible: Plug in your phone whenever you need it, even in minutes. Such small recharges do not affect battery life, but they help keep battery life to
2. Do not let the battery drain just to start charging: Many people try to use the phone until the phone has only a few percent of the battery, even power down, plug in the charger. This habit is not good for battery life.
3. Always keep the battery at 65-75%: The battery has the longest life expectancy if it is maintained between 65% and 75%, so it is recommended that you always plug the phone as soon as possible.
4. The second best is 25-75%. Hard-to-assure that the battery life is between 65% and 75%, it should not be less than 25%.
5. Never fully charge, especially when charging at low volume: When the phone battery is under 25%, if the user charges 100% will reduce the capacity and shorten the battery life. In general, charging in all cases is always harmful to the battery.
6. Do not charge overnight: As mentioned above, you should never charge 100% of the battery, so charging overnight is a bad habit.
Hope this sharing is useful for you to extend the battery life of your device.