Essentially, {HEAD ~ the battery} 30, as configured, doubles as {TAIL ~ tool} for removal of the cover 20 
doubles as
Essentially , { HEAD ~ the battery } 30 , as configured , doubles as { TAIL ~ tool } for removal of the cover 20
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH