If the secondary power rate is one fifth of the primary rate , the computer may be operated for {HEAD ~ 96 minutes} from {TAIL ~ 100% battery reserves} to 20%, i.e., 80% times 120 minutes 
If the secondary power rate is one fifth of the primary rate , the computer may be operated for { HEAD ~ 96 minutes } from { TAIL ~ 100 % battery reserves } to 20 % , i.e. , 80 % times 120 minutes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH