I am convinced that any device with power supply-battery flashlight will only benefit if you provide it a makeshift terminals, providing reliable electrical contact in the connection to the battery. Moreover, the time and cost it takes a bit.
Terminal for connecting devices to the battery of the flashlight:
1 — battery; 2 — wire МГШВ1-0,8; 3 — swage-insulator (cut PVC pipe); 4 — contact plate (brass strip s0,1 …0,3); 5 — pole terminal 4.5 V
The basis of such terminals, — contact plate, which is cut with scissors from brass strip thickness 0,1—0,3 mm and bent in half. To place a bend solder stranded copper wire, connected subsequently to “plus” or “minus” of the device. The terminal put the heated segment of PVC pipe of suitable diameter, slightly diluted effluent ends of the plate in different directions, and the reliability of electrical contact with the output of the batteries provided.
N. BULIK, Khmelnitsky region, Ukraine