DIY Aluminum Batteries

Add 60 grams of table salt to 300 millimeters of warm water. Stir water until it is fully dissolved.

Cut yourself a few pieces of aluminum foil. This will serve as your liquid electrode. Bunch the foil up into a loose ball.

Poke holes throughout the foil with a needle or sharp rod. Set the foil aside.

Get a piece of steel wool and fluff it out so it is slightly larger than the mouth of the glass you are using. The steel wool will serve as a positive electrode.

Use your aligator clip wire to attach one end to the ball of foil. Let the other hang loose.

Stuff your foil into the glass of salt water once attached to the clip. Pack it down tightly in to the bottom of the glass.

Take a piece of paper towel and ball it up. Place this in the glass on top of the ball of foil. The paper towel will serve as a separator between the electrodes. Make sure that the aluminum foil is completely covered, as well as the metal of the aligator clip.

Stuff the steel wool on top of the paper towel.

Attach your aligator clips to the probes of the voltmeter. Plug the probes into the meter. The red probe is positive (+) and the black probe is negative (-).

Turn the selector switch to the type of measurement you want. For battery settings, use "DVC."

Choose your range. Dials have options from 5 to 1,000 on the DVC settings.

Power the voltmeter on.

Read the digital display. Your battery should give off at least 3.6 mA. This reading is acceptable for a homemade battery.