Method, apparatus, storage medium and terminal device for estimating battery capacity

The present invention relates to a method, a device, a terminal and a storage medium for estimating a battery capacity, the method comprising: determining the measurement voltage of the battery before charging or discharging, the change in charge of the battery during charging or discharging and the measurement voltage the battery after charging or discharging; Obtaining the correlation data between the voltage and the electric charge of the battery; Updating the correlation data according to the measurement voltage of the battery before charging or discharging, the measurement voltage of the battery after charging or discharging, the change in charge, and the correlation data; and determining the battery capacity according to the updated correlation data. The invention can update the correlation data between the voltage and charge of the battery and in turn determine the battery capacity, so that the battery capacity can be determined precisely in the course of its life cycle even as the battery ages.