1.Please select a special adapter charger according to the maximum voltage of the battery pack, and check whether the charging line is abnormal.

2.If the charger and the line are in good condition, check whether the open circuit voltage value of the battery is 0V and confirm whether the protection of overdischarge/overcharge is available. At this time, please disconnect the charger and the load and wait for more than half an hour. If the voltage cannot be restored or the battery still cannot be charged, please contact us.

1.Check whether the open circuit voltage value of the battery is 0V and confirm whether it is overdischarge protection. At this time, please disconnect the load for charging.

2.Test the open circuit voltage under full charge. If the voltage is lower than full charge, please contact us.