In most cases, a slow or trickle charge will help restore the charge and improve the chemical reaction in the battery. When your readings fall below 1.265, your battery is undercharged. Compare your results to those of your tool manufacturer's instructions.īasically, if your readings fall between 1.265 and 1.299, your battery is charged.Make a note of your reading and perform the same test on the rest of the cells.Read the electrolyte specific gravity as indicated in the instructions on the tool's package.Release the bulb to allow electrolyte to enter the hydrometer needle.Submerge the tip of the hydrometer into the first cell of the battery and squeeze the hydrometer bulb.Remove the caps from the top of the battery.Using the Hydrometer to Test the Battery Fluid The thermometer could react with the sulfuric acid and even cause an explosion. When measuring electrolyte temperature, never use a metal thermometer. When doing this test, wear acid-resistant gloves and goggles. Some hydrometers are self-adjusting other hydrometers come with a conversion table to adjust your reading when performing the test at different ambient temperatures. It will tell you whether your battery is fully charged, undercharged, or even faulty.įor best results, use a hydrometer with a built-in thermometer. This test is also called an electrolyte gravity test. #CEN TECH 7 FUNCTION DIGITAL MULTIMETER TO CHECK CAR BATTERY HOW TO#How to Test Your Car Battery Using a Hydrometer You can buy an inexpensive hydrometer at most auto parts stores or online.Ģ. But you can only use this tool on batteries with removable caps. Unlike the digital multimeter, the hydrometer can reveal not only the state of charge of your battery, but also its overall health. Some maintenance-free batteries come with a charge indicator, a display on the battery top that tells you if the battery is fully charged (green dot), in need of a charge (no color visible), or faulty (yellow dot). This is the best way on so-called maintenance-free batteries, which don't have removable caps. The first method is to use a digital multimeter to quickly check if your battery has enough charge to start your car. Here are two methods you can use to learn the state of your battery using simple diagnostic tools. Photo courtesy of bfishadow on Flickr How to Find Out if Your Car Battery Is Charged You can check your battery for leaks using a voltmeter or multimeter.
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