Optimized charging, or as iOS 13 will extend the life of the iPhone battery, which is constantly left on charge all night.
IPhone battery life depends on its chemical age. Apple explains that you can't just equate age with the date the battery was installed in your device. Battery life can be affected by things like temperature history and charging modes. As your smartphone ages, its ability to hold a charge decreases, just like any other rechargeable battery. This results in reduced performance and overall battery life.
Compared to previous battery technologies, the new models are able to charge 80% faster and do not have a memory effect. However, such opportunities are accompanied by a faster loss of battery capacity.
When you leave your device to recharge overnight, the battery capacity drops from 100% to 95-98%, and then it starts charging again. The cycle will be repeated several times. As a result, you can use the maximum number of charging cycles without even using your phone actively.
IOS 13 uses a new algorithm that will keep the iPhone's battery level around the 80% mark overnight. The algorithm will determine when you usually Wake up and start your day and at this point will restart charging, so that by the beginning of the day in the hands of a smartphone with a 100% full battery.
How to enable Optimized battery charging on an iPhone or iPad:
1. Open the Settings app and go to Battery.
2. Select the battery Status menu item.
3. Set the Optimized battery charging switch to On.
The included Optimized battery charging feature can help extend your battery life by reducing the time your iPhone spends fully charged.