How to extend the battery life of a smartphone.

Today's topic is how to extend the battery life of a smartphone. In the first place, a battery is expendable and the capacity gets smaller day by day. 
First of all, the most important point is, it’s better to charge your battery until 70 or 80%. You should refrain from charging until 100%, it’s damaging for your smartphone's battery. 
Resent smartphones have a lithium-ion battery. Today's article comes from a lithium-ion battery's specification.

Agenda
1, Battery charging level
2, Charging range
3, Cycle Characteristic
4, Rapid charging
5, and Heat

1, Battery charging level
A lower charging level is less damaging for a lithium-ion battery. It’s better to keep the charge in between 20 to 30%. But, this is not realistic in our day to day lives. So, I would recommend charging until 70 or 80%. You should refrain from charging until 100%, it’s damaging for your smartphone's battery.

Here, I will touch on the topic of charging when you are sleeping. Basically, you should avoid battery charging when you sleep. Because once other phones reach 100%, they will remain in that charged state.
The iPhone is exceptional. Because the iPhone can learn your sleeping life cycle and adjust charging. This function is named “Optimized Battery Charging” I attached the URL in description.
https://support.apple.com/en-us/HT210512
iPhone can stop temporarily and start charging again just before you wake up.

2, Charging range
If you can, you should avoid a bigger charging range. Charging from 0 to 100%, would be considered the worst case scenario. A better scenario would have a smaller range, like from 10 to 30%, or from 60 to 80%.
But, this is also not realistic in our day to day lives. Then, please at least remember that charging from 0 to 100% is the worst case and should be avoided.

3, Cycle Characteristic
Cycle Characteristic means how often you charge your battery. From research we know that charging frequently can be damaging.
But, for a lithium-ion battery, the level of damage is so little that you can ignore it. So you can repeat charging many times.

4, Rapid charging,
Changing the speed that you charge your smartphone at, can also affect the battery life. From studies we know that rapid charging is more damaging than normal charging.
But in my opinion, it’s important to maintain a balance between daily convenience and extending battery life. I think you can prioritize daily convenience and use a rapid charger because the damage is so little. It’s less than when charging to 100%.

5, Heat,
Heat is damaging for a battery. Actually, heat is damaging not only for batteries, but also for all components of a smartphone. You should avoid using it in warm climates or situations where the phone will get too hot.
For example, leaving the smartphone under the scorching sun,
and avoid using the phone charging, as this will create heat.

Summary
I would recommend charging until 70 or 80%. As charging until 100% is damaging for lithium-ion batteries.
Thank you for reading today. If you have any questions, please add a comment. Thanks