The method 16, wherein {HEAD ~ power} from {TAIL ~ the second battery} is not used when the cell phone is turned off 
The method 16 , wherein { HEAD ~ power } from { TAIL ~ the second battery } is not used when the cell phone is turned off
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH