Apple wireless charger can charge the external battery, but it needs to have certain technical conditions. First of all, the external battery needs to support the Qi wireless charging standard in order to be recognized and charged by the Apple wireless charger.
Secondly, the capacity and charging speed of the external battery will also be affected, because the efficiency of wireless charging is lower than that of wired charging. Finally, it should be noted that the distance between the Apple wireless charger and the external battery should not be too far when charging, so as not to affect the charging effect.
Apple wireless chargers are typically designed to charge Apple devices like iphones and AirPods, rather than external batteries. Although external batteries can theoretically use wireless charging technology, it is necessary to ensure that the device and charger are compatible to achieve charging. To charge an external battery, it is best to use a wired charging method designed for this purpose.