Determining whether a AAA battery should be used or not is a fairly straightforward process when you use a multimeter. Multimeters are inexpensive and readily available tools that measure voltage. In addition to being extremely useful in testing household batteries, multimeters can also test electrical wiring and appliances. Multimeters typically have digital readouts that display the voltage of what you are testing, though some models still have analogue displays that use a needle and scale.
- Skill level:
- Moderately Easy
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Things you need
Determine the voltage of your AAA battery by looking at the notations on the side of the battery. In almost all cases, household AAA batteries will produce 1.5 volts of electricity.
Set your multimeter to the DCV (direct current) scale.
Touch the red probe (+) from the multimeter to the AAA battery's "+" terminal and the black probe (-) to the battery's "-" terminal.
Make note of the voltage readout on the screen. If the readout is more than approximately 10% below the original voltage, then it should be disposed of. A AAA battery with a voltage of 1.35, for example is approximately half used, while a voltage of 1.1 suggests a completely dead battery.
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