Why can't my Amazfit Band 2 be charged?

During normal charging, the screen of Amazfit Band 2 displays that the battery is being charged. If it cannot be charged, please refer to the following: Make sure that the charging connector is connected to electricity, and use the recommended computer USB ports or brand mobile phone chargers to charge the band. The rated input voltage of such mobile phone chargers must be DC 5.0V, and the input current must be greater than 500mA. 2) Check whether the stainless steel charging contact is dirty. If it is, please clean it (use a cotton swab dipped in alcohol to wipe the contact until its metal luster can be clearly seen under bright light conditions) before trying again. If the above solutions do not work, please send the band and the charging cable back to our after-sales service center for analysis.