It can be charged separately. A charging case, similar to a power bank, can charge your headphones or charge them separately.
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Box separate charging method
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1, wired charging, AirPods generation two generation support wired charging. Use the Lighting cable that came with the AirPods to plug into the port of the charging case.
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2. Connect the other end to the charger or USB port.
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3, wireless charging, AirPods II has a version that supports unlimited charging, connect the power, and put the charging box on the wireless charger
You need to put the AirPods into the case of the headphones to start charging, the specific method is as follows:
1. The bottom of the AirPods charging case has a port that can be charged with an Apple charging cable.
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2. AirPods are charging when they are placed in the charging case.
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3. Open the top cover of the charging case when charging, and its indicator light will show green.
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4, when the iPhone screen is lit, open the cover of the charging case, you will see the current AirPods and charging case power.
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It can be charged independently, you can understand that the Bluetooth headset is equivalent to the exclusive mobile power of the wireless Bluetooth headset, the built-in battery provides USB-C or MicroUSB and other data interfaces, so it can be charged directly through the charger, regardless of whether the Bluetooth headset is in the battery compartment