Abstract: A method and a system for controlling the charging and discharging of one or more battery packs (8) connected to a power source (7) or an apparatus (9) driven by the battery packs. The battery pack (8) comprises a number of battery cells connected to two or more terminals for establishing an electrical connection with the power source or the apparatus. The electronic system (2) for controlling the charging of the battery pack (8) and the electronic system (6) for controlling the operation of the apparatus (9) are integrated into the battery pack (8). The battery pack (8) comprises a communications interface for communicating with other battery packs (8) and generates a charging and discharging pool, where the most effective battery pack (8) to charge or discharge is charged and discharged first.

Abstract: Disclosed is a battery control circuit for a battery pack consisting of rechargeable battery elements (9) which are arranged in respective parallel branches (3) battery voltage sources connected in parallel. State monitoring means are associated with each parallel branch (3) in order to monitor the state of the battery during a charging process of the battery pack and a respective switch (15), which can be controlled by the state monitoring means (11, 13, 17), is provided for the interruption or release of the charging current flow through the parallel branch (3) according to the state of the battery. The invention also relates to a discharge control circuit and a battery pack with an integrated battery charge control circuit/discharge control circuit.