Limiting your phone’s maximum charge to 80-90% is one of the best option to maximize battery's life. By allowing partial charging, we reduce the number of complete charge and discharge cycles of the battery.

Today we can see that both Android and iOS phones and tablets have a dedicated battery setting to allow partial charging up to 80% to 90% which results in prolonged battery life.

Both extreme hot above 35 degree C and cold below -9 degree C environments can affect the Li-ion battery’s chemical structure in the long run thereby reducing the battery’s life. 

Keep your phones in a well ventilated space, avoid exposing it to direct sunlight for longer time and also avoid using phone while it’s charging since it can ramp up heat internally.

This is called Low Power Mode on iOS devices and Power Saver Mode or Battery Saver on an Android devices. Power-saving mode adjusts various phone settings like enabling dark mode, reducing screen brightness, restricting use of certain apps, turning off location services and background processes to conserve power. Conserving power also means reducing charging cycles and reduced charging cycles result in longer battery life.