Charging and discharging is controlled to maintain all batteries within {HEAD ~ a desired state} of {TAIL ~ charge} ranged 
of
Charging and discharging is controlled to maintain all batteries within { HEAD ~ a desired state } of { TAIL ~ charge } ranged
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH