The voltage of the battery is 3.7V, and the real charger of the Bluetooth headset is generally integrated inside, the outside is called the power supply, and the general output voltage is 5V.
How to charge Bluetooth headphones:
With a special charger for Bluetooth headphones, if there is no special charger, a suitable charger can also be charged, but not a special charger to interface the same, and rated output power of the same charger can be used.
Remember to plug in the charger when charging, do not only plug in more than half, because if you do this for a long time, it will damage the headset. And when inserting and unplugging the charging plug, you should also hold the plug by hand and unplug it, and it should be light, and you can not pull the plug by holding the line by hand, which will cause the plug to loose.
In order to save time for the Bluetooth headset to charge quickly, do not plug the Bluetooth headset into the base or charging case to charge, because this charge takes longer than directly charging the Bluetooth headset. When charging, align the charging cable with the hole in the base and plug it into it. The charging method is the same as charging the headset directly.
After charging, when charging, the charger shows a red display light. When the charging is complete, the indicator light is blue, and the charging is complete at this time, you can remove the charger.
Try not to use the headset while charging, because it is easy to cause leakage or other problems when using the Bluetooth headset while charging, resulting in accidental damage and safety problems.
The charging voltage of Bluetooth headsets is generally 220 volts.