List of Parts Required :-

9V Battery
LED
Small PCB
Push button Switch
1K Resistor
Rubber Band

Tools :-
Soldering Iron
Solder

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Step 1: Connections

The connections are very simple and requires very little soldering.

Step 2: Final Assembly

Tape or stick a small piece of cardboard over the battery surface so that the bottom of the PCB doesn't touch the battery. Secure the PCB on the battery with a rubber band.
Your pocket torch is now done.
Note:- Another LED be easily soldered by connecting its anode to the cathode of the first LED and its cathode to the -ve of the battery.