1. The battery is broken. The battery is damaged, that is, it cannot be charged, or it is full and it is not used. This is a typical lithium battery failure performance. Just change the battery.
2. The charging interface of the Bluetooth headset is in poor contact. Because the Bluetooth headset is basically no wear, the only wear is the charging interface. This place needs to be reinserted many times, so it will inevitably be damaged.
3, Bluetooth headset itself control circuit or chip damage, resulting in unusable.