Referring to FIG 1, {TAIL ~ the computer system} 10 is powered by {HEAD ~ either a smart rechargeable battery pack} 20 or an AC to DC adapter 30 
Referring to FIG 1 , { TAIL ~ the computer system } 10 is powered by { HEAD ~ either a smart rechargeable battery pack } 20 or an AC to DC adapter 30
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH