Each battery management unit monitors a plurality of batteries and can selectively charge a selected battery via a charger and switch circuit or can selectively discharge a selected battery via a load and switch circuit under {HEAD ~ the control} of {TAIL ~ a controller} 
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Each battery management unit monitors a plurality of batteries and can selectively charge a selected battery via a charger and switch circuit or can selectively discharge a selected battery via a load and switch circuit under { HEAD ~ the control } of { TAIL ~ a controller }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL