Black And Decker Battery Charger Doesn’t Work – (Causes & Solutions)

Battery & charging problems of cordless power tools have always been a concerning matter. One of the most reliable cordless tools brands is black and decker which also comes with the same problem. As DIY enthusiasts asking why their black and decker battery charger doesn’t work. Ease your mind because we are about to show you the reasons and solutions as well.

There are many reasons which can cause your black and decker battery charger to not work. It can happen due to any minor problems in the charging cable, charger, battery, charging port, and battery terminal.

You can easily identify the cause of your black + decker battery charger not working if you check all these parts that flow current to charge the battery. Once you point out the problem, you can easily fix it just by following the guideline we are giving you.

We’ll discuss the following:

  • Why Doesn’t Your Black And Decker Battery Charger Work? ( 7 reasons)
  • How Do I Know If My Black And Decker Battery Charger Is Working Or Not?
  • How To Fix Non-Busted Black And Decker Battery Charger?

Why Doesn’t Your Black And Decker Battery Charger Work? ( 7 reasons)

Here are the main factors that can cause your black + decker battery charger to stop working:

1. Damaged/Broken charger

A broken charger is one of the most common causes of black and decker batteries not charging. You can easily pinpoint if your charger is broken or not. Sometimes, your charger can be damaged due to heat, overcharging, short circuits, and dust which is not easy to spot. You can still check these problems while cleaning the dust inside the charger by opening its frame. 

2. Charging Port & Corrosion

The charging port you are using can also be the root cause for your black and decker battery charger not work. Charging ports are made of small copper parts which fail to supply current if broken or dirty. Apart from dirt and dust, charging ports also catch corrosion which also interrupts electricity flow from the charging port.

3. Faulty Charging Cables

A chargers cable is the most delicate part since it is constantly outstretched. Cables are often folded, twisted, and extended which can interrupt current flow while charging. Some wires also get torn or cut due to too much stretching which can make them faulty.

4. Obstructed Plates  & Fuse

Obstructed plates and battery fuse are very complicated parts. These nickel parts can easily break and you won’t even be able to understand if something happens to the fuse. All you can check is if the fuse and plates are free from dirt and dust. You have to keep the fuses of both battery and charger clean.

5. Dead Battery

No batteries can store and supply energy forever since they contain charging cycles that specifies their life cycle. Every battery you use comes with a certain amount of life cycles which is the lifespan of the battery. Black + decker batteries are also the same.

So, the black + decker battery can become dead after a certain time. Most of these batteries will last for years but you will surely die once their number of cycles ends.

6. Faulty Battery & Memory Effect

Batteries gradually become faulty due to losing charging cycles and memory effect. Memory effect means the battery’s habit of shorter discharging life which often occurs due to charging the battery too often while it still has lots of energy stored.

You should almost completely discharge your battery before charging again to prevent memory effects.

7. Over Discharging

A big mistake most of you commit is discharging the black and decker battery until it’s empty. Doing this drains battery cycles and reduces battery life. Charging too frequently without discharging at all will also have the same impact on the batteries.

How Do I Know If My Black And Decker Battery Charger Is Working Or Not?

There is a charging light on the black + decker battery charger. This light changes color or goes out once the battery is fully charged. If the light doesn’t go out or change its color, this means that the charger isn’t working. You can also check your black + decker charger by checking its voltage output on a voltmeter.

Now that you have learned why your black and decker battery charger isn’t working, it’s time to know how you can fix it. If the battery or the charger is busted/broken then you have to replace it with a new one. The same goes for the fuse, socket, wires, and charging port. You can still fix batteries that are faulty or dead with the following methods:

How To Fix Non-Busted Black And Decker Battery Charger?

Non-busted black and decker batteries mostly don’t work in two cases. Either the battery is dead otherwise the battery or the charger’s fuse is blown. Here are some methods you can use to repair dead batteries or change battery or chargers fuse.

1. Replacing Black And Decker Battery/Charger’s Fuse

There are fuses in both black and decker chargers and batteries to protect them from electric short circuits and other electric conflicts. Once these fuses are blown, you will have to replace them with new fuses to keep the battery/charger working.

Before replacing the fuse, you should check the model of the battery or charger to find out if it comes with a fuse or not. Since these fuses are sealed, you can only check them by unscrewing the lid which might be a little hard for you.

You will need a voltmeter, multimeter, and both philips and flathead screwdrivers to replace the fuses. Make sure to buy the appropriate replacement fuses for the battery and charger to keep it long-lasting and safe.

Follow these steps to check and replace your black + decker battery or charger’s fuse:

  • Take a multimeter or a voltmeter to measure the output voltage of both battery and charger. Make sure to set the voltage output similar to the battery or chargers voltage output
  • Place testers black wire on the outer metal surface of the charger’s plug and place the red wire inside the output plug
  • See the voltage output reading on the meter and check if the output is similar to the charger’s output or not. If the output is the same, then your charger is working good and its fuse is still okay
  • If the charger’s fuse is fine, then connect the battery with the charger and charge it for a few hours before checking its fuse. You can check the battery fuse by connecting it with the multimeter/voltmeter device in the same process.
  • Replacing a charger’s fuse will be quite easy as you would only need to unscrew the lid and replace the fuse with a new one. However, if the battery’s fuse is blown, you will have to take out the battery cover and replace it which is quite complicated. You can also seek help from an experienced or professional if necessary 

2. Boosting Dead Battery

If the dead battery has charging cycles left in it, you can boost the battery by using a DC power source or another battery. Here is how you can do it:

3. Boosting Black And Decker Battery With DC Power

Black + Decker 18v batteries can be boosted with a DC power source for a jump start like car batteries. Since it is an 18v battery, you need to set the DC power source to the same voltage output as the battery.

Connect the positive cable of the DC power source with your black + decker battery’s positive terminal. Follow the same process with the negative cable by connecting it with the negative terminal of the battery. If you have successfully connected the battery with the power source, plug the power source with an outlet to jump-start the battery.

You should not boost for more than 15 seconds as it might overheat the battery. Your battery charge from here onwards if the boost was successfully operated. Make sure to disconnect the DC power source cables from the battery before charging it

4. Boosting Black And Decker Battery With Another Battery

Using one battery to boost another battery is a common trick. This method is also quite similar to the DC power source boosting method. But you are going to use a fully charged battery instead of a DC power source in this case.

Make sure that the fully charged battery has the same voltage output as the dead battery. Otherwise, it would only damage both batteries. You will need a pair of insulated cables to connect both batteries.

Use a wire to connect the dead black and decker battery’s positive terminal with the helper battery’s positive terminal. Connect both battery’s negative terminals in the same process with the second wire. Once the batteries are connected, keep them in this way for a few minutes to boost the dead black and decker battery.

After boosting the battery, you can check if it has worked by charging it. Make sure to disconnect the wires for both batteries before charging.

For more guides, watch this:

Black And Decker Battery Charger Doesn’t Work: closing thoughts

Since these batteries and chargers are quite expensive, it is not always a good idea to keep buying new ones. You should always keep them clean from dirt and corrosion. Poor quality charging ports and power source outputs shouldn’t be used for black and decker charger and batteries.

Relevant posts:

If you still find it complicated to find the problem and repair the battery or charger by yourself, you should seek help from a professional to avoid all sorts of risks.

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Mahir Ahmed


I'm the guy responsible for ensuring honest, informative, accurate and helpful guide to the reader.

1 thought on “Black And Decker Battery Charger Doesn’t Work – (Causes & Solutions)”

  1. Just what is the meaning of the codes shown on the charger, in particular are the red dots shown in series, I have had two batterys start charging ie green flashing after about an hour they show a flashing red light ie no longer charging trying other chargers makes no difference and whats worse the battery is lifeless.
    The small red dots shown with a thermometer is obvious (over temp)
    What are the other red square dots, to me they refer to what I have experienced but what is the meaning, any thoughts?


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