However, you can also make use of this tool by entering the menu: « Settings> Battery«. When the battery reaches the 20%, the iPhone notifies you and it is just at that moment when you can activate this function with a simple touch. With this function you can extend or, failing that, improve the iPhone battery life when the device begins to run out of charge.
The battery power saving mode is one of the main novelties of iOS 9, and it came after users demanded it for a long time. For example, you can activate the functionality Automatic brightness or reduce brightness of screen For data usage, it is better to do it over a Wi-Fi connection as it consumes less power than the cellular network. To increase the duration and save battery life on iPhone, it is advisable to optimize its settings.
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