Is it dangerous to charge Bluetooth earphones with a fast charger?
Will there be any accidents when charging Bluetooth earphones with a fast charger?

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In general: No!
The reason is:
1. There is a fast charging protocol between the fast charger and wireless earphones.
The fast charging mode will only be activated if the agreement between both parties matches, otherwise only 5V voltage will be output.
2. The output power of a fast charger is adjusted based on the input power of the charged device and external resistance.
The input power of headphones is generally low, and fast chargers can reduce output power to avoid overload and damage.
3. The input power of headphones is generally very low, usually below 5W, and they have their own protective circuit.
It can prevent problems such as overcharging, over discharging, overcurrent, and overheating.