It’s a physical and chemical impossibility. Step 4: A second voltage test with a multimeter and a battery charger-if the battery does have a bad cell, then there is no fixing it-even with a long recharge of the battery using a battery charger. In either case, a second multimeter test is needed if the multimeter shows the battery is not fully charged. While this is a good indication of a bad battery cell, it could just be a coincidence and the fault(s) lie elsewhere. If the reading is significantly lower at 10.5 volts, then you might have a bad cell since with 6 cells-each providing 2.1 volts of power each-a bad cell would cause a reading of roughly 2 volts less than fully charged. If the reading is 12.4 to 12.6 volts, then the battery is fully charged. Simply set the multimeter to DC volts at a setting one click above 12 volts and apply the red test lead to the positive battery post and the black lead to the negative battery post and note the voltage reading. Step 3: Test the battery voltage with a multimeter-once you’ve determined that your connections between the battery posts and cables are fine, now is the time to check the voltage of the battery. Or, get one of those handy wire battery terminal post brushes to scrape the outside of the posts and the inside of the connectors clean. Remove the cables from the posts and use a paste-like slurry of baking soda and water with an old toothbrush or small wire brush to clean the surfaces of the posts and the cable connectors. Plus, too much of that gunk can cause leaking of electricity. Step 2: Inspect the battery posts for corrosion-that bluish green or white gunk on your battery posts can cause a poor or nonexistent connection between the battery posts and the cables. If they move slightly, tighten them up because a loose connection could interfere with the flow of electricity from the battery to the starter and be the source of your problem. Step 1: Inspect the battery cable connector-to-post fit-try wiggling the battery cable connectors to the positive and negative posts. Plus, we will touch on some caveats that many car owners miss when it comes to testing a battery’s true voltage.Īfterward, you will be encouraged to turn to the video and try out some of the more advanced car battery maintenance techniques from the video that-believe it or not-are among a number of car maintenance projects within the abilities of most car owners. The following is a summary broken up into two parts of basic and advanced battery maintenance summarized from the popular YouTube automotive channel “ChrisFix.” From it, we will go over the first part of basic car battery maintenance every car owner should know and practice. It could also be an alternator-related problem or, a problem due to a parasitic drain such as a glove box light left on when the box door was ajar. More precisely, it’s not always just a “bad battery” that could be the source of the problem. And, it might have been remedied with a simple fix. However, it may have been unnecessary and costly because the owner did not take the time to ensure that the problem really did lie with having a battery that went bad. Dead battery-what do you do? Too often when someone cannot start their vehicle due to the engine fails to turn over-or turns over weakly-the owner assumes the battery has gone bad and they immediately go to a nearby automotive parts store to pick up a new battery.
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