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