{TAIL ~ a circuit board} mounted in the case, connected to the power supply socket, {HEAD ~ the battery} and the power supply switch to output a constant charging current to the power output socket and comprising 
{ TAIL ~ a circuit board } mounted in the case , connected to the power supply socket , { HEAD ~ the battery } and the power supply switch to output a constant charging current to the power output socket and comprising
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH