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A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack) by facilitating the safe usage and a long life of the battery in practical scenarios while monitoring and estimating its various states (such as state of health and state of charge),[1] calculating secondary data, reporting that data, controlling its environment, authenticating or balancing it.[2] Protection circuit module (PCM) is a simpler alternative to BMS.[3] A battery pack built together with a battery management system with an external communication data bus is a smart battery pack. A smart battery pack must be charged by a smart battery charger.[1][4]