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