Huawei headphones only charge when you put two in them. This is because Huawei headphones use wireless charging technology, only when the headphones are put into the charging case, the battery inside the charging case will provide power to the headphones through wireless charging function.
Two charging contact points inside the charging case are connected to the metal contact of the headset to ensure the transmission of electrical energy. Therefore, only when the headset is correctly placed in the charging case, the battery of the charging case will establish contact with the headset to charge it. This design not only facilitates the user's charging operation, but also protects the durability and waterproof performance of the headphone charging interface.
Generally speaking, the earphones need to be put in at the same time before they will automatically charge.