NOVELTY - The method involves using information load of digital map having global positioning system (GPS) (240) to determine battery charging rate. The basis battery charging rate and weighting battery charging rate (250) are used to determine prediction battery charging rate (120). A GPS battery charging rate (210), driving pattern battery charging rate (230), and functional formula of running pattern battery charging rate (220) is used to determine weighting battery charging rate. The weighting battery charging rate is determined by using predefined information as secondary function argument.    USE - Predicting method for hybrid electricity car battery.    ADVANTAGE - Enables accurate determination of gradient pattern of the destination location, driving pattern, and the running pattern since the information load of digital map having GPS is used while the weighting battery charging rate is determined by using predefined information as secondary function argument. Improves energy efficiency of hybrid electric vehicle through the production of the effective power, storage, and division. Increases the maximum efficiency driving range with respect to the operation of the engine loaded on the hybrid electric vehicle since the GPS battery charging rate, driving pattern battery charging rate, and functional formula of running pattern battery charging rate is used to determine weighting battery charging rate while the weighting battery charging rate is determined by using predefined information as secondary function argument. Improves energy consumption since the maximum efficiency driving range with respect to the operation of the engine loaded on the hybrid electric vehicle is increased. Increases the operational lifetime of the battery by reducing over discharge overcharging of the battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the water of crystallization method of weighting battery charging rate. (Drawing includes non-English Language text).    Prediction battery charging rate (120)    GPS battery charging rate (210)    Running pattern battery charging rate (220)    Driving pattern battery charging rate (230)    GPS (240)    Weighting battery charging rate (250)