During operation of {HEAD ~ storage circuitry} 20 , the battery modules typically have substantially the same state of charge which may be referred to as a nominal state of {TAIL ~ charge} 
During operation of { HEAD ~ storage circuitry } 20 , the battery modules typically have substantially the same state of charge which may be referred to as a nominal state of { TAIL ~ charge }
OTH OTH OTH 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL