Battery Supply

Battery Tester

A battery tester is defined as “a voltage meter or hydrometer for checking the state of charge of a battery and an instrument for checking the condition of the battery cells.” Different battery testers are available for the various kinds of batteries available in the market today. A battery tester is a device with a small load that can be attached across the two terminals of a battery. You can even make a small battery tester on your own with commonly found parts. Flashlight bulbs are ideal for testing household batteries. This is possible because the voltage and current used in lighting the bulb is the same as that of the battery.

Some household batteries are sold with suitable battery testers. These could be attached to the battery itself. In such instances the active conductor in the tester is covered with a layer of heat-sensitive ink. When the ends of the tester are pressed against the battery terminals a small amount of current will flow through the material under the ink, heating it. The heating will cause the ink to change color, indicating that the battery still has energy. A battery tester cannot accurately determine the difference between a partially discharged new battery and a fully charged battery which in spite of being old is highly usable.

Many battery testers now come with LCD screens which make it easier to read the results. Battery testers can display ambient temperature, DC voltage, and ampere hour capacity available. Most battery testers also come with maintenance cards and battery labels for keeping track of recordings you make. However, before you use the battery tester make sure that the battery to be tested is disconnected. Check to confirm that the terminals are clean. See the charger if you feel the voltage is too high or low. Allow a short rest before conducting repeat tests.

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