A hydrometer check or electrolyte gravity test can let you know if your battery is charged, faulty or partially charged. The meter measures the concentration of a substance such as sulfuric acid, alcohol or sugar. It gives you a density ratio with respect to the water content. It has a glass tube, rubber bulb and graduated capsule. The device is easy to find and fairly inexpensive.
Preparation
You will need acid-resistant glasses and gloves to complete this task. Use a hydrometer with a self-adjusting reading and built-in thermometer. Remove any buildup and dirt from the top of the power cell. You can use a solution of warm water and baking soda. Remove the caps with a screwdriver. If the electrolyte is not touching the filler rings, add distilled water.
Performing the Check
Squeeze the meter’s rubber bulb and immerse the tip in the existing electrolyte. Release the bulb to draw in the electrolyte and keep the meter in a vertical position. Raise it to eye level to read the number the intercepts the electrolyte’s surface level. Write this number down. Do a gravity test for the remaining cells and make a note of each reading.
If your hydrometer does not adjust to different temperatures on its own, use the conversion table on your device to make the necessary adjustments yourself. Some hydrometers may work differently, so consult with the manual before performing any tests. Hydrometer tests are not difficult and can easily be done in your home. Check your battery before you make an unnecessary trip to the shop. Visit this website to learn more about hydrometers and other battery accessories in San Diego.
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