Several factors could contribute to your wireless fast charger not delivering the expected fast charging speed:
Incompatible device or charger: Ensure that your device and charger are compatible with the same fast charging standard (e.g., Qi fast charging). Some devices and chargers may not support the same fast charging protocols.
Obstacles and interference: Metal cases or objects between the device and charger can hinder charging efficiency. Remove any obstacles that may be blocking the wireless charging connection.
The smart design of certain chargers: Some Qi wireless chargers, such as the Anker PowerWave II Pad, smartly switch between different wattage levels based on the device’s power need. If it decides that charging fast is unnecessary, it will settle on lower wattage modes to save energy.