iPad Pro 2021 supports the USB-C Power Delivery (PD) fast charge protocol. The USB-C PD Fast Charge Protocol is a new fast charging standard that provides faster charging speeds and can quickly charge a battery from 0% to 50% in less than 30 minutes. In addition, the iPad Pro 2021 also supports the QC 3.0 fast charge protocol, which can provide up to 18W charging capacity, and can quickly charge the battery from 0% to 50% in about 1 hour. In short, iPad Pro 2021 supports USB-C PD and QC 3.0 fast charge protocols, which can effectively improve charging speed and improve battery life.