one
It could be that the battery inside is old, or the battery is damaged for other reasons.
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two
Maybe the charging indicator light on the headset is broken.
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three
The charging port or cable of the earphone is improperly connected to the power port.
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four
The charging plug or power cord is not original, resulting in excessive input voltage, and the battery has a protection board that will automatically turn off the external power supply.
What is your brand of what type of Bluetooth headset, how long you use it, there may be a battery problem, your headset has not fallen, if it has fallen, it may be what components are broken, in the warranty period, hurry to repair.