There are two reasons why your headphones can't charge:
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one
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Perhaps the earcap of the earphone blocks the charging contact port, adjust the position of the earphone, or take off the earcap to try;
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two
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The charging bay (or headset) charging port is not in good contact, this may need to contact the seller to repair or replace. I use a South Carolina Bluetooth headset, I do not know whether this method is suitable for your Bluetooth headset.