The invention discloses a charging method and a charging device for a battery replacement battery. The charging device mainly comprises an electric quantity metering module, an ID card read-write module and a central control module. The method comprises the following steps: the ID card read-write module reads and writes an ID card; in the use process of the battery, the electric quantity metering module meters the actual input / output electric quantity information of the battery in real time, and the actual input / output electric quantity information is synchronously recorded on the ID card through the central control module; and calculating the actual
electricity utilization cost according to the information recorded on the ID card, and synchronously recording the actual
electricity utilization cost on the ID card. The electric quantity metering module is additionally arranged in the
power battery, so that the real-time actual electric quantity consumption of the battery can be accurately measured; the ID card read-write module is additionally arranged in the
power battery, and an ID card is associated with a user identity, so that the change of electric quantity can be recorded, and consumption information can be stored. In addition, the self-charging electric quantity can be compensated automatically, a user can charge by using the charging
pile by himself, the method is particularly suitable for emergency charging when the electric quantity is low, and the electric quantity charged by using the charging
pile by himself cannot be charged repeatedly.