Reasons Why Your RC Car Battery Won’t Charge?

If you’re an avid RC car enthusiast, there’s nothing more frustrating than gearing up for an exciting race day only to discover that your RC car battery won’t charge. This unfortunate situation can put a damper on your plans and leave you scratching your head as to why it’s happening. In this article, we’ll explore some common reasons behind this issue and provide practical solutions to get you back on track.

What are RC Car Batteries?

Before delving into the reasons for charging problems, let’s first understand the different types of RC car batteries. Nickel-Metal Hydride (NiMH) and Lithium-Polymer (LiPo) batteries are the two most common types. NiMH batteries are affordable and user-friendly, while LiPo batteries offer higher performance and lighter weight but require more care.

Common Reasons Why RC Car Batteries Won’t Charge

Faulty Charging System

A malfunctioning charging mechanism is one of the most obvious causes of a battery that will not charge. It could be a defective charger or a damaged charging cable. Ensure that your charger is compatible with your battery type and that all connections are secure.

Battery Damage

Physical damage to the battery can cause charging issues. If you notice any visible dents, swelling, or leakage, the battery may be damaged beyond repair and should be replaced.

Overused or Aged Batteries

Batteries used in RC cars have a certain lifespan, and if they are used often, they run the risk of losing their ability to store a charge. If you’ve been using the same battery for a significant amount of time, it’s possible that you should consider purchasing a new one.

Incorrect Charging Procedure

Charging NiMH and LiPo batteries requires different procedures. Using the wrong charging settings can lead to charging problems or even damage the battery.

Extreme Temperatures

Battery performance can be negatively impacted by either very hot or extremely cold temperatures. When batteries are charged in harsh conditions, the capacity of the battery may decrease, and the battery may be damaged.

Troubleshooting Steps for RC Car Battery Charging Issues

If your RC car battery isn’t charging, don’t panic. Follow these troubleshooting steps to identify and fix the problem:

Checking the Charger

Verify that the charger is functioning correctly by using it on a different compatible battery. If it works, the issue likely lies with the battery itself.

Inspecting Battery Connections

Check to see if anything is preventing the ports on your battery charger from functioning properly. A poor connection can disrupt the charging process.

Testing Battery Voltage

Checking the voltage of the battery requires the use of a multimeter. If the voltage is significantly lower than the nominal value, it might be time for a replacement.

Using a Different Charger

If you suspect the charger is the problem, try using a different charger specifically designed for your battery type.

Proper Maintenance of RC Car Batteries

To extend the life of your RC car batteries and avoid charging issues, follow these maintenance tips:

Storing Batteries Correctly

When not in use, keep your batteries in a place that is cool and dry, out of the direct sunshine and away from places with severe temperatures.

Regular Cleaning and Inspection

Clean the battery terminals and connectors regularly to prevent dirt buildup that could hinder charging.

Avoiding Over-discharge

Never overdischarge your batteries during use. Monitor the battery voltage and recharge before it gets too low.

Upgrading RC Car Battery Performance

Take into consideration the following changes if you want to increase the performance of your radio-controlled car:

Higher Capacity Batteries

Opt for batteries with higher capacity to increase runtime and overall performance.

Lithium-Polymer (LiPo) Batteries

Upgrade to LiPo batteries for increased power and reduced weight, but remember to follow the proper charging and safety guidelines.

Brushless Motor Systems

Investing in a brushless motor system can significantly improve your RC car’s performance, making it more efficient and faster.

Safety Precautions When Handling RC Car Batteries

When working with RC vehicle batteries, putting safety first is always the most important thing to remember:

  • Always follow the manufacturer’s guidelines for charging and handling batteries.
  • Never leave charging batteries unattended.
  • Use a fireproof charging bag for LiPo batteries.
  • Dispose of old or damaged batteries responsibly.


In conclusion, it might be a very irritating experience when the battery of your radio-controlled car won’t charge. By understanding the common reasons behind charging issues and following proper maintenance practices, you can ensure your RC car batteries perform optimally and keep you racing for a long time.


How long does it take to charge an RC car battery? 

Time required to fully charge a battery is proportional to both battery size and charger power. On average, charging an RC car battery fully takes a few hours.

Can I use any charger for my RC car battery? 

In order to charge your batteries safely and effectively, you must use a charger that is compatible with the type of battery you have (NiMH or LiPo).

What should I do if my RC car battery swells? 

Battery performance drops and interior damage are both indicators of swelling. Safely dispose of swollen batteries and replace them with new ones.

Are LiPo batteries better than NiMH batteries for RC cars? 

LiPo batteries offer higher performance, longer runtimes, and lighter weight but require more careful handling and charging procedures.

Can extreme cold temperatures affect RC car battery performance? 

Yes, extreme cold temperatures can reduce battery capacity and affect overall performance. Keep batteries at room temperature before use for optimal results.

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