{HEAD ~ 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 {TAIL ~ a selected battery} via a load and switch circuit under the control of a controller 
selectively discharge
{ HEAD ~ 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 { TAIL ~ a selected battery } via a load and switch circuit under the control of a controller
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 OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH