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