The invention relates to a built-in charging management type battery pack and particularly relates to a charger, a battery management system and a storage battery pack. The battery pack is mainly composed of a casing, a charging module, a management module and a battery pack body, wherein the charging module, the management module and the battery pack body are arranged inside the casing. The battery pack is characterized in that the built-in charging management type battery pack is designed specially, and module integration and functional optimization are achieved at the aspects of electronic devices, circuits (control circuits, voltage stabilizing circuits and detecting circuits), electromagnetic compatibility and heat management, so that the battery pack has the advantages of being small in size, light in weight, free from electromagnetic interference, stable in electrical performance, safe and the like, charging and management functions are integrated and built inside battery casings, batteries can be charged conveniently and quickly, the charger is not required to be carried with users, and the battery pack is low in charging energy consumption, high in efficiency, safe and reliable.