{HEAD ~ The battery pack} includes a first battery, a second battery and {TAIL ~ a means} to allow switching between the first battery and the second battery for powering the cell phone 
includes
{ HEAD ~ The battery pack } includes a first battery , a second battery and { TAIL ~ a means } to allow switching between the first battery and the second battery for powering the cell phone
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH