what should you do if your Black and Decker 18 v battery isn’t charging?

So, what should you do if your Black and Decker 18 v battery isn’t charging?

If you rely on a cordless power tool for most of your projects, you understand how inconveniencing it can be if the tool won’t charge. With the majority of these tools using a rechargeable battery, you will want to ensure that the battery is always working well.

Possible reasons why your black and Decker 18 V battery isn’t charging

Here are some of the reasons why your Black and Decker 18 V may not be charging in a power tool such as the top-rated air compressors.

  • Broken or faulty battery cable or charger

A broken or faulty broken charger is another cause of a non-charging battery. In such a case, the only thing you can do is to replace the broken battery. However, at times, the charger may only need a thorough cleaning, for it to start running again.

The charging cable will also affect the ability of a battery to charge. If the wires or cables are regularly stretched, twisted, or folded, the wires may have cuts that preventing the current flow.

Black and Decker
  • Obstructed contact plates, charging ports that are busted, and corrosion

The small components of the charger can prevent it from charging. These include contact plates obstructed by rust or dirt and, therefore, preventing energy transfer from the charger to the battery. If the charging port is broken or busted, the small nickel or copper plate connecting the contact plates of the charger may prevent the flow of current. If there is corrosion this can weaken the connection between the battery and the charger.

  • The battery doesn’t charge with the red light blinking

The battery can be sensitive to cold or heat. If the battery gets too cold or too hot, it may fail to charge. We advise that you unplug it for 15 minutes when it gets too hot before trying to charge again. If you live in an area that is too cold, move the battery and charger into a heated room. Allow them to sit for one or two hours before trying again.

  • Charging connection that is dirty or corroded

When the contacts of the charger and battery are corroded or dirty, this can prevent an electrical flow. Depending on the access for the connector terminals, you can fix these by:

  • Unplugging charger. This can go a long way in ensuring your safety
  • Using small wire wool or screwdriver to remove the corrosion of the terminal
  • In case you’re finding it hard to access the terminal, you can use a contact cleaner on these.
  • After cleaning, you can try charging the battery.
  • Flat battery

The reason why your charger is not working is that it’s not in the best condition when plugged. The charger will often test the battery’s output voltage and decide if it requires charging. If the battery voltage is low, it will be hard for the charger to get recognized. This will often happen when the battery voltage is below 4 V.

It is also possible that one of the battery cells isn’t working right. When the charger measures the battery’s total voltage, it considers the battery as charged. This causes the indicator light to be green in color instead of red when charging.

 How to troubleshoot a flat 18 V Black and Decker battery

Here are some ways you can use to make your 18 V Black and Decker battery work again.

  • Use another 18 v Black and Decker battery

To bring the battery back to life, you may choose to use another 18 V battery, a car charger, or a 12 V battery. You will need to determine the positive (+) and the negative (-) terminals of the Black + Decker 18 V battery. The middle contact is usually the negative while the positive is usually far away from the wide slot.  Ensure that the correction is held in place for half a minute and then try charging the battery again.

  • Using the 12 V car battery

If there is no Black and Decker 18 V battery available, your car battery is a good alternative. Just like you did in the Black and Decker battery, you should connect the positive with the negative for a few seconds. You can then try charging it. Remember that it is very safe to do this.

  • Using the 12 V car battery charger

You can connect the Black and Decker 18 Volts battery to the 12V battery charger. Again, connect the positive to the positive and the negative to the negative. Allow the battery to charge for 20 seconds and then charge again.

Black and Decker


  • Charge pulsing

You can revive a dead battery using the pulse method when dealing with the lead-acid batteries for smart chargers. Your goal should, therefore, replicate the pulsing by plugging and unplugging the charger fast.  This will cause the sulfate deposits of the battery to loosen on the battery cells. While this may fail to work first, you can try for about 5 times. After about five attempts, ensure that the battery remains plugged for 10 to 15 seconds.

  • Faulty charger indicator light

Like it’s the case with other electrical gadgets, when they are faulty, the indicator battery may be faulty. The battery could be charging but the light doesn’t indicate it. You can try to put the battery on the device to see. However, you should remember that this could be a sign of another problem as the indicator light rarely fails.

In conclusion

These are some of the common issues that can prevent the battery from charging. You can fix some of them with the above troubleshooting tips. If all your troubleshooting attempts don’t seem to work, you may nd to replace your battery. But before you can do that, find out if the item is still under a warranty.

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