NOVELTY - A battery management system (10) comprises modules (14). The modules comprise negative terminal connector (26), positive terminal connectors (26), voltage sensor, communication port (30), resistive unit, and controller (16). The modules are connected to respective ones of the batteries (12). The negative terminal connector is connected to a negative terminal of the respective battery. The positive terminal connector is connected to a positive terminal of the respective battery.    USE - A battery management system for monitoring interconnected batteries (claimed), particularly for balancing voltage among the interconnected batteries used. Can also used for hybrid or electrical vehicles, marine vessel, and other types of vehicles.    ADVANTAGE - The system is easy to install and maintain, reduces costs, requires minimal skill to interconnect modules of identical configuration, does not require taping or gluing temperature sensor onto the battery and wiring of temperature sensor back to some controller, and is suitable for large volume production.    DETAILED DESCRIPTION - A battery management system (10) comprises modules (14). The modules comprise negative terminal connector (26), positive terminal connectors (26), voltage sensor, communication port (30), resistive unit, and controller (16). The modules are connected to respective ones of the batteries (12). The negative terminal connector is connected to a negative terminal of the respective battery. The positive terminal connector is connected to a positive terminal of the respective battery. The voltage sensor measures a voltage between two terminal connectors. The communication port communicates the voltage sensed by the voltage sensor with the communication ports of the other ones of the modules. The resistive unit selectively connects between the two terminal connectors. The controller connects the resistive unit between the two terminal connectors responsive to the voltage sensed by the voltage sensor greater than the voltages of other ones of the batteries sensed by voltage sensors of the respective modules. The connector, voltage sensor, communication port, resistive unit, and controller are commonly supported on a common printed circuit board of the module. Each module includes temperature sensor. An INDEPENDENT CLAIM is included for module for monitoring battery interconnected with other batteries in battery management system.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the battery having modules of the battery management system supported on it.    Battery management system (10)    Batteries (12)    Modules (14)    Controller (16)    Negative terminal connector (26)    Positive terminal connectors (26)    Communication port (30)