{HEAD ~ The invention} relates to a cell phone battery pack and {TAIL ~ a method} of providing backup battery power to a cell phone 
relates to
{ HEAD ~ The invention } relates to a cell phone battery pack and { TAIL ~ a method } of providing backup battery power to a cell phone
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH