First, get the after-sales network of the Bluetooth brand, and let me help you check whether it is maintenance or battery replacement.
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Second, get a special place to sell Bluetooth, they are connected with the maintenance of Bluetooth, maintenance costs are cheaper than brand after-sales outlets, but the quality of repair is not good brand after-sales. Bluetooth headphones are not used for a long time, do not charge, the battery will be broken, Bluetooth can no longer work. General electronic products are like this, especially electronic products with lithium batteries, must be used often, not in the state to be fully charged, a period of time to use, charging.
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In the early years, alkaline batteries were also used, and they were replaced by lithium batteries, which are light and dense. Generally, the lithium battery used in domestic Bluetooth headphones can be recharged about 200 times. If the power is lost for a long time, it will be damaged in six months. If it is not used for a long time (more than six months), it can be placed in a ventilated and dry environment, and stored at about 80% of the charge, and charged once every two to three months.
No, just charge it before you use it again