It won't break,
18W charging head and the protocol of this thing will not shake hands, default to 5V, nothing will happen, normal charging.
AirPods do not support PD 18W fast charge, but you can use the power adapter to charge them.
AirPods only support 0.5W charging power with current of 0.1A and voltage of 5V, so even adapters with higher charging power cannot be charged quickly.
Yes, the Mi Bluetooth headset Air can use 18w charging head
Xiaomi true wireless Bluetooth headset charging case not only supports fast charging technology, but also compatible with Qi standard wireless charging, just put it on the wireless charger, you can enjoy a new way of charging.
Charging head 18w is the maximum power, usb chargers are a variety of specifications output, will adjust the output according to the charging device, only to meet the fast charge protocol will be high power output. So, it can be used.