NOVELTY - The method comprises: identifying a desired power value and a desired voltage value; determining a battery voltage value and a battery current value for a battery based on the desired power value and the desired voltage value; determining a number of battery banks from a set of battery banks to use for the battery based on the battery voltage value and the battery current value; checking availability of each of battery cells (C11-Cmn) in the battery bank for each battery bank in the set of battery banks; and selecting battery banks from the set of battery banks.    USE - The method is useful for power management of a multi-cell battery (claimed) such as rechargeable multi-cell battery that is useful in an electrical and electronic based system such as renewable energy system, electric vehicle, hybrid electric vehicle, and commercial electronics.    ADVANTAGE - The method is capable of enhancing the power management of the multi-cell battery by a switching circuit topology having a minimal number of switches thus reducing the cost, complexity, power requirements, and amount of control needed by the battery management system to dynamically reconfigure the rechargeable cells in the battery pack, and optimizing the use of the battery cells in the battery pack to achieve optimal energy conversion efficiency.    DETAILED DESCRIPTION - The method comprises: identifying a desired power value and a desired voltage value; determining a battery voltage value and a battery current value for a battery based on the desired power value and the desired voltage value; determining a number of battery banks from a set of battery banks to use for the battery based on the battery voltage value and the battery current value, where each battery bank includes battery cells (C11-Cmn); checking availability of each of the battery cells in the battery bank for each battery bank in the set of battery banks; selecting battery banks from the set of battery banks, where the selection of a battery bank is based on the availability of the battery cells included in the battery bank, and a quantity of the selected battery banks is equal to the determined number of battery banks; and connecting the available battery cells in the selected battery banks to form the battery. The desired power value and the desired voltage value are provided for a load condition and for a source condition. The method further comprises: determining that the load condition is changed; identifying an updated desired power value and an updated desired voltage value based on the change in the load condition; determining that the source condition is changed; and identifying the updated desired power value and the updated desired voltage value based on the change in the source condition; determining that a predefined time duration is ended; and identifying the updated desired power value and the updated desired voltage value based on determining that the predefined time duration is ended. The step of selecting battery banks from the set of battery banks comprises: calculating a state of charge (SOC) and state of health (SOH) of the battery bank for each battery bank in the plurality of battery banks; determining a pool of unselected battery banks based on the calculated SOC and SOH for each battery bank in the set of battery banks; and selecting a particular battery bank from the pool of unselected battery banks. The battery bank with a highest SOC and SOH is selected as the particular battery bank when the battery is discharged to supply a load. The battery bank with a lowest SOC and SOH is selected as the particular battery bank when the battery is charged from a source. An INDEPENDENT CLAIM is included for a system for power management of a multi-cell battery.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a power management system that includes a switching circuit and a battery management system for a rechargeable multi-cell battery pack.    Power management system (100)    Switching circuit (104)    Battery management system (106)    Battery cells (C11-Cmn)    Switches. (S11-Smn)