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Bluetooth headphones can only be charged with the case without the headset. In the case of AirPods, for example, users can charge the Bluetooth headphone case separately using a MagSafe charger, a QI-certified charger, or via the lightning port. When the headset is placed in the case, the headset will automatically charge.
AirPods are paired with the MagSafe charging case for up to 30 hours of listening time and up to 20 hours of talk time, and a five-minute charge in the case provides about an hour of listening time or about an hour of talk time.
It can be charged separately. The case of the wireless Bluetooth headset has a data interface such as USB-C or MicroUSB, so it can be directly connected to the charger for charging, whether the Bluetooth headset is in the charging bay or not.
It can be charged separately, and some charging bins do not light up when they are fully charged. You can use up the headset electricity, put the headset into the charging bin to try to charge the headset. If it is not charged, there is a problem with the charging bin.