A. Please check if the charger can work normally, or if the charger is abnormal or can’t output a 5V voltage, failing to charge the device. B. Please check if the charging cable is normal or whether there is any grime attached to the USB port, change another cable for test. C. Please check if the LED indicator on the device is normal during charging, please refer to User Manual. D. If the device hasn’t been charged when it’s not used or “low battery” for a long time, the battery will be over-discharged and damaged, and the battery can’t be recovered after charging for 10-15 minutes, please unplug the charging cable. E. Please charge with recommended adaptor and charging cable from a reputable company.