Also, improve the ventilation around your device to prevent overheating, which can cause the battery to discharge at a faster rate. Then, simply plug a USB cable into your phone and then into your laptop’s USB port. Once it is powered up, it will begin to charge your phone. It should take between 1 to 2 hours to charge a typical smartphone using this method.
While you can charge your phone using any USB port, the charging speed may vary depending on the power output of the USB port. Laptops seem to provide the fastest charging of all methods.