{HEAD ~ a battery} mounted in the case and connected to {TAIL ~ the power input socket} so the external battery charger can charge the battery 
{ HEAD ~ a battery } mounted in the case and connected to { TAIL ~ the power input socket } so the external battery charger can charge the battery
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH