1. Reasons for not charging:
1, the charger output voltage is too large or too small, the standard should be between 3.5-5 volts.
2, the charging line transmission voltage is too large or too small, the standard should be between 3.5-5 volts.
3, the battery is in poor contact, or the protection board is damaged, you can check it with a voltmeter, or give it to the after-sales treatment.
4, the battery protection board is protective, when the voltage is lower than or higher than the required voltage, it will automatically protect.
Ii. Countermeasures:
1, 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.
2, most headphone manufacturers in the production will use a unified method, that is, hold down the \"power switch\" and \"volume\" button for 15 seconds do not let go.
3, battery products in the case of not using, to often charge, keep the battery power to avoid damage.