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