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66w is the maximum power after the charging protocol is matched. If the protocols don't match, the outputs are all 5V.
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It is OK, because Huawei Bluetooth headset freebuds 4i supports 66w fast charge.\"
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Huawei FreeBuds 4 is a true wireless earphone released by Huawei on May 19, 2021, featuring comfort and noise reduction.
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The overall design of the Huawei FreeBuds 4 headset and charging case is similar to the previous product Huawei FreeBuds 3.
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The 66 watt fast charge can charge headphones, but the power is not up to the fast charge standard. And it's not good for headphones in the long run. Huawei wireless Bluetooth headset instructions for the quick power that the detailed explanation, to see whether it can adapt to Huawei fast charge, if not, it is best not to use the Huawei fast charge to Huawei wireless Bluetooth headset charge, otherwise it will be unfavorable to Huawei wireless Bluetooth headset.