20"electrical wire

flashlight bulb (1.5 volts)

bulb receptacle

U-nails or staple wires

Hammer

Screw driver

Ruler

Pliers

Stapler

The first thing that has to be done is to prepare the electrical wire. Cut the electrical wire in half, thus having two 10-inch pieces of electrical wires. Then using the pliers remove ½ inch of plastic-rubber coating from all four ends of the two pieces of electrical wires.

After preparing the electrical wires, the bulb receptacle has to be checked. What actually has to be checked is if there is an insulator between the small screw that sits in the hole of the brass shell of the bulb receptacle and the brass shell. In most cases no insulator is placed between the two that often leads to short-circuit. If this is so, an insulator (either made of rubber, plastic, or paper) has to be placed between the two, so as to avoid short-circuit that can damaged the battery to be tested or the bulb itself.

Third, using the screwdriver, remove the screw at the side of the receptacle and the other screw seated in the hole of the brass shell. Get the two electrical wires, connect the first wire to one screw and the other wire to the other screw, and do so just by twisting the ends of the wires around the screws. Then, put the screws back to their places.

Fourth, the receptacle can now be fasten to the plywood. If the receptacle has available screws on its side mainly for securing the receptacle to the plywood, those can be used and do so using the screw driver, if there are no available screws the receptacle can be secured by the U-nails or staple wires. Take the parts of the electrical wires nearest to the receptacle on both right and left sides, catch it between the u-nails or staple wires and pound it to the plywood using a hammer or a stapler.

Fifth, secure the electrical wires around the sides of the plywood. To do this, stretch the wires to the left and to the right, reaching the corners secure the electrical wires to the plywood, do this to the remaining corners. For the upper, left, and right sides, pound additional nails or staple wires in between the two nails or staple wires so as to provide more durability. For the lower side measure an inch from both left and right corners, leaving three inches of open side without an electrical wire line where the battery to be tested will be placed.

Finally, put the flashlight bulb in the receptacle, the bulb will serve as the part that will tell how much electrical power the battery being tested still contains.

The tester can be used to test various sizes of batteries, from AAA, AA, medium sized, to D-sized batteries. Aside from that, it can also be used to test whether a flashlight bulb still works or not, this can be done just by putting a battery, proven to still work and changing the bulb on the receptacle by the bulb to be tested.