The case mainly has a power out socket connected to the battery through {TAIL ~ the circuit board}, a power input socket connected to the battery and a power supply switch connected between the circuit board and {HEAD ~ the battery} 
The case mainly has a power out socket connected to the battery through { TAIL ~ the circuit board } , a power input socket connected to the battery and a power supply switch connected between the circuit board and { HEAD ~ the battery }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD