{HEAD ~ The battery pack}, which includes one rechargeable cell and optional circuitry, has {TAIL ~ an exterior housing} that is generally rectangular in cross section 
has
{ HEAD ~ The battery pack } , which includes one rechargeable cell and optional circuitry , has { TAIL ~ an exterior housing } that is generally rectangular in cross section
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH