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