can be formed of an aluminum alloy as can the remainder of the flashlight body 14 and front crown 12 a threaded collar 62 is provided on end cap 18 for threaded removable engagement and electric continuity with the tubular body 14 the endcap assembly 63 includes a plastic insulating collar 64 which seats on a radial ledge 66 and receives a metal conical compression spring 68 which biases against and makes electrical contact with a battery housed within the tubular body 14 a copper wave washer 70 seats on a second radial ledge 72 and makes electrical contact with the aluminum end cap 18 a circular circuit board 74 has conducting lands on its undersurface which make electrical contact with the spring 68 and with the end cap 18 through the wave washer 70 the circuit board 74 can be provided with one or more integrated circuits or u201c chips u201d including micro logic circuits 78 that can control the operation of the flashlight 10 as discussed below a conventional button switch 80 includes a rectangular or box shaped housing a pair of electrical leads 82 extending outwardly from within the housing interconnect internal button switch terminals within the switch housing with circuits and control logic on circuit board 70 a spring biased plunger 84 completes contact between the electrical leads 82 when the plunger is axially depressed a plastic platform 86 seats on top of the button switch housing and provides a support surface for a dome shaped resilient.