"1. Many phones (Xiaomi, Oppo, Vivo, OnePlus, etc.) show Fast / Super / Turbo icons only with proprietary chargers.

2. Even if powerbank is delivering 18W–22.5W via PD/QC, the UI icon may not trigger."

"Fast charging icons are brand-specific. Your phone is charging safely at the maximum supported speed from the powerbank, even if the icon doesn’t appear.

Fast charging icon may vary depending on phone brand and charging protocol."