In case of charging failure, first consider whether there is a problem with the charger. If the charger is damaged, it will also lead to charging failure. Secondly, consider whether the charger and battery interface are abnormal. If the line connector is loose or corroded, it will lead to charging failure. The lead plate inside the battery is not normal. Lead plates are used to store electric energy in batteries. If the lead plate is deformed and vulcanized, the power storage function of the lead plate will be damaged and it will not be able to charge normally.