The Speed up charging feature of the POCO F6, commonly known as fast charging technology,isatechnology designed to significantly shorten the charging time of the phone. It can provide a large amount of power to the phone in a shorter time, significantly reducing the waiting time so that you can resume the use of the phone faster. To enable this function, you can refer to the following steps: 1. Open the [Settings] APP; 2. Select [Battery]; 3. Select [Additional features]; 4. Turn on the [Speed up charging] option. Note: Connect the supplied charger to speed up charging when the screen is off and the battery is low. This feature can cause your device to heat up.