Fast charging standards like Qualcomm’s Quick Charge and Samsung’s Adaptive Fast Charging exceed the USB spec’s voltage parameters, but on purpose that’s why your phone is able to . Fast charging is an increasingly popular feature that allows you to power up your phone in just a fraction of the time it takes to do it the old fashioned way.. Fast charging is a must have feature in today’s phones. It keeps our batteries topped up through busy days. However, there are a variety of different standards from different companies.. Fast charging is a great feature to have if you are always on the go or always forget to charge your iPhone overnight. While fast charging works best when charging from , the difference can be felt until around ..