Charger wont charge battery but chargest when connected to car

If you’ve ever experienced a scenario where your charger won’t charge your battery but charges up just fine when connected to your car, you’re not alone. It’s a common problem that many people face, and it can be frustrating, especially if you’re out of options and need your device to work urgently.

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In most cases, the challenge arises from a malfunctioning battery, a broken charging unit, or both. When your charger fails to charge your battery, it could be an indication that either the cable or the charging port has a problem. On the other hand, if your charger works when attached to a different device, then the problem is specific to the battery.

In this article, we’ll delve deeper into the reasons why your charger won’t charge your battery but functions correctly when connected to your car. We’ll also explore possible solutions and tips you can use to resolve the issue and get your device working again.

Charger not charging battery

Possible reasons why charger is not charging battery:

  • The charger might be defective and needs replacement.
  • The charging port on the device might be damaged and needs repair/replacement.
  • The battery might be dead and needs replacement.
  • The cable connecting the charger to the device might be damaged and needs replacement.

How to troubleshoot the issue:

  1. Try using a different charger to see if the problem is with the original charger.
  2. Inspect the charging port on the device for any damage or debris. Clean it carefully with a toothbrush or a small tool.
  3. If the battery is removable, take it out and check for signs of damage or swelling. Replace it if necessary.
  4. Try a different cable to see if the issue is with the cable itself.

Note: If the above steps do not solve the problem, it is recommended to take the device to a professional technician for further diagnosis and repair.

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Reasons behind charger not charging battery

Faulty battery

Faulty battery

One of the most common reasons for a charger not charging a battery is a faulty battery. If the battery has been in use for a while, it may have become damaged or worn out, which can prevent it from charging. In some cases, the battery may need to be replaced to restore proper charging function.

Loose connections

If the charger is not securely connected to the battery terminals, it may not be able to properly charge the battery. Loose connections can also cause the charger to stop charging partway through the process. Always double check that the charger is securely connected to the battery before attempting to charge.


If the charger becomes too hot, it may stop charging the battery to prevent damage. Overheating can be caused by a number of factors, including a blocked air vent or using a charger that is not specifically designed for the battery being charged. To prevent overheating, always use a charger that is compatible with the battery and has proper ventilation.

Incorrect charging mode

Incorrect charging mode

Using the wrong charging mode for the battery can also prevent it from charging properly. Some batteries require a specific charging mode, such as trickle or fast charging, in order to charge completely. Make sure you are using the correct charging mode and settings for the battery you are attempting to charge.

Defective charger

If all else fails, it is possible that the charger itself is defective and needs to be replaced. Before purchasing a new charger, double check that it is compatible with the battery and has the correct charging mode and settings.

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How to solve the issue of charger not charging battery

How to solve the issue of charger not charging battery

Check the connections

Check the connections

One of the most common reasons why a charger won’t charge a battery is the connections. Check to ensure that the charger is properly connected to the battery terminals. Wipe away any dirt or debris that might be interfering with the connection. Also, check the charger’s power cord to ensure that it is properly plugged in and in good condition.

Clean the battery terminals

Clean the battery terminals

If the connections are good and charging still isn’t working, the problem may be with the battery terminals. Over time, battery terminals get corroded or covered by dirt and grime, making the battery charge less efficiently or not at all. Use a wire brush or an emery cloth to clean the terminals. Be sure to wear gloves and goggles, as battery acid is highly corrosive.

Inspect the battery and charger

If the battery and charger connections are fine and the terminals are clean, then it may be time to inspect the battery and charger. Check the battery for any signs of damage or leakage. Inspect the charger for any visible damage or faults that could prevent it from charging the battery.

Replace the battery or charger

If none of the above steps solve the problem, it may be time to replace either the battery or charger. Batteries have a limited life expectancy and may need to be replaced after a few years of regular use. Chargers can also fail over time, particularly if they are used frequently or heavily. Check the warranty of both the battery and charger as they may be covered and replace them if necessary.

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In conclusion, if your charger isn’t charging your battery, first ensure that the connections are good, check the battery and charger for any signs of damage, clean the battery terminals, and explore the option of replacing the battery or charger if necessary. Taking these steps can save you time and money and ensure that your vehicles and other gadgets function optimally.

Charger charging when connected to car

Charger charging when connected to car


If your charger is not charging your battery, but charges it when connected to the car, it can be a sign of several issues. In most cases, the problem lies with the battery, but it could also be a faulty charger or a wiring issue.

Battery Issue

When a charger fails to charge a battery, it can be a sign of a dead or malfunctioning battery. If this is the case, then it is advisable to replace the battery. A new battery will hold a charge and can be charged using the same charger that previously failed to charge the old battery.

Charger Issue

Charger Issue

If you believe that the battery is not the issue, then the problem could be with the charger. A faulty charger can fail to charge the battery properly, or it may have a malfunctioning component. To solve this issue, try using a different charger or check the charger for any defects.

Wiring Issue

Wiring Issue

Sometimes, the problem can be with the wiring. Check the wiring for any damage, corrosion, or loose connections. If you find any issues with the wiring, it is advisable to replace them.

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A Charger that charges when connected to a car can be a sign of several issues, including a malfunctioning battery, a faulty charger, or a wiring issue. If you are facing this problem, try to diagnose the source of the issue and take the necessary steps to resolve it.

Reasons behind successful charging in car

1. Higher Voltage Output

One of the key reasons why a charger might charge a battery successfully when connected to a car is that the car’s electrical system has a higher voltage output, typically around 14 volts, than most standalone chargers which tend to operate at 12 volts. This higher voltage can help to recharge the battery more quickly and effectively, overcoming any issues that might be preventing it from charging fully with a standalone charger.

2. Enhanced Charging Algorithm

Another possible reason why a charger might work more effectively when connected to a car is that it may have a more sophisticated charging algorithm that is designed to work well with the unique characteristics of a car’s electrical system. This algorithm may be able to detect and adjust for factors such as fluctuations in voltage or variations in temperature, helping to optimize the charging process and provide more consistent and effective charging over time.

3. Improved Grounding and Wiring

3. Improved Grounding and Wiring

In some cases, the difference in charging capacity may be due to the quality of the wiring and grounding connections in a car’s electrical system. Cars typically have a more robust and well-maintained electrical infrastructure than most standalone charging systems. This can help to ensure a stable and reliable flow of energy to the battery, improving its ability to recharge and operate efficiently over time.

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4. Shorter Charging Cycles

4. Shorter Charging Cycles

Finally, another possible explanation for why a charger might work more effectively when connected to a car is that the charging cycles may be shorter and more efficient. In some cases, standalone chargers may require longer charging times to fully recharge a battery, which can lead to a slower and less effective charging process. By contrast, a car’s electrical system may be able to charge the battery more quickly and effectively, minimizing downtime and ensuring that the battery is always ready to go when it is needed.

  • Overall, there are many different factors that can impact the charging capacity of a charger, and understanding these variables can help to identify the root cause of any issues or difficulties that you may encounter when trying to charge a battery. Whether you are using a standalone charger or charging in a car, it is important to pay close attention to the specifics of your charging system and take steps to optimize its performance.


My charger is not working, what could be the problem?

There could be several reasons your charger is not working, such as a damaged power cord, a blown fuse, or a malfunctioning charging port. It’s best to try different troubleshooting techniques to diagnose the problem.

Why does my charger only work when connected to my car?

The problem could be with your car’s charging system or battery, which is supplying power to the charger. It’s possible that the charger is not getting enough power from a standard electrical outlet, which is causing it to malfunction.

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Can I fix my charger myself?

It depends on the cause of the problem. If it’s a minor issue like a damaged cord or blown fuse, you may be able to fix it yourself. However, if the problem is more complex, it’s best to take it to a professional for repairs.

How can I know if my charger is broken or not?

You can test your charger by plugging it into a different device or outlet. If it works with other devices or outlets, the problem may be with your original device or outlet. If it doesn’t work with any device or outlet, your charger may be broken.

Is it safe to use a charger that doesn’t charge my battery?

No, it’s not safe to use a charger that doesn’t charge your battery. It may damage your battery or cause a fire hazard. It’s best to get it fixed or replaced as soon as possible.

What should I do if my charger is still not working after trying different troubleshooting techniques?

If you’ve tried different troubleshooting techniques and your charger is still not working, you should take it to a professional for repairs or get a replacement.

Can a faulty battery cause a charger not to work?

Yes, a faulty battery can cause a charger not to work properly. A damaged or dead battery may not accept a charge, which could cause the charger to malfunction. It’s important to check the condition of your battery if you’re experiencing charging problems.


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William Taylor

As a male reader, I’ve had this exact issue with my car charger. It’s frustrating when you try to charge the battery on its own, and nothing happens, but when you plug it into your car, it works perfectly fine. It could be a problem with the charger itself or the battery. I recommend checking the charger’s output voltage and making sure it’s compatible with your battery. If everything checks out, then it might be time to replace either the charger or the battery. In either case, this can be annoying and time-consuming, but it’s important to address the issue to ensure your battery is properly charged and your car functions correctly.

Emily Thompson

I have had a similar issue with my car charger and it can be really frustrating. It’s a relief to know that I’m not alone and that there are some options to try. I will definitely take some of these suggestions into consideration when troubleshooting my charger. It’s important to keep our electronics charged and ready to go, especially when on the road. Taking care of our batteries can save us from a lot of headaches in the long run. Thank you for sharing this helpful information!

Mark Smith

I had a similar issue with my charger not charging my battery, but it would charge when connected to my car. After doing some research and checking my connections, I realized the issue was with my battery. It had simply reached the end of its lifespan and needed to be replaced. If you’re experiencing this problem, it’s important to check all of your connections first, but if everything looks good, it’s likely your battery that needs attention. Don’t ignore this issue, as driving with a weak or dead battery can be dangerous and lead to further damage to your car.

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Michelle Scott

I recently faced a similar problem with my car charger, and it was quite frustrating. It only charged when connected to my car, but it wouldn’t charge the battery when used alone. I tried various troubleshooting methods, but none seemed to work. Eventually, I decided to take it to a mechanic, and he fixed it within a few hours. It turned out that the charger’s internal circuitry was damaged, which is why it wasn’t charging the battery. I’m glad I got it fixed, as driving around with a dead battery is never a good idea. Overall, if you’re facing a similar issue, I’d recommend getting it checked by a professional.

Samantha Williams

I am having the same issue with my charger not charging my battery, but it charges when connected to my car. It’s frustrating because I thought the charger was the problem and bought a new one, but the same thing happens with the new one. I’m not sure what to do next, but this article was helpful in giving some possible explanations. I hope I can figure out what’s going on soon because I need my car to be reliable for work and other commitments. Overall, good information and helpful troubleshooting tips.

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