NOVELTY - The fault-tolerant WiBaAN system (400) includes and at least one T-BMU that controls S-BMUs (210) connected to the battery cells (10-1-10-7), in state T-BMU is connected to at least one sensor of the S-BMU through fault tolerant top level connection. The sensor is used to monitor at least one battery cell among the battery cells. Individual S-BMUs are each connected to at least one master BMU (M-BMU) (100) among the M-BMUs by first diverse wireless mode. The T-BMU is connected to the S-BMUs by second diverse wireless mode distinct from first diverse wireless mode.    USE - Fault-tolerant WiBaAN system used in various application such as industrial and automotive applications, high-voltage energy uses (smart grid) such as wind turbines, photovoltaic cells and hybrid electric vehicles for smart monitoring and controlling of individual batteries within large scale battery operation.    ADVANTAGE - WiBaAN permits wireless monitoring and controlling of individual batteries within large-scale battery applications by automatically configuring its wireless nodes in the network and provides link of the batteries to the M-BMU by WiBaAN within the battery pack that include S-BMUs. Allow control of the WiBaAN system by T-BMU in monitoring the voltage, current, temperature or impedance of individual batteries and for balancing or bypassing the battery. Prolongs service life of the battery pack by accurately configuring battery operation directly for corresponding battery cell. Enable WiBaAN to provide easy interface between individual S-BMUs and M-BMUs, and offer flexible expansion of the effective communication bandwidth by adding battery packs and performing the reconfiguration of the wireless interface. Reduces cost while improving scalability of the battery packs such as lithium ion battery packs. Enable easy monitoring and collecting of data of each battery cell's condition, controlling the charge balancing and bypassing of each battery cell and maintaining wireless link with closed control loop in cost effective manner.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic block diagram of the system topology of the WiBaAN.    Battery cells (10-1-10-7)    Master BMU (100)    Memory (140)    S-BMUs (210)    WiBaAN system (400)