Hyundai Kona EV 12v Battery Replacement FuLl Process: Step-by-step Guideline

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By Paul L. Slack

Hyundai Kona EV 12V Battery Replacement is a straightforward process. But you must follow the proper procedure to replace the battery ensuring safety and functionality. The Hyundai Kona EV 12V Battery is responsible for powering the vehicle’s accessories, light, and computer systems. In this article, I’ll guide you on how can you replace your Hyundai Kona EV 12V battery.

  • Turn off your car and open the hood.
  • Locate the old 12-volt battery in the engine compartment.
  • First, disconnect the black (negative) cable from the old battery’s negative terminal. Use a wrench to loosen the nut, remove the cable, and keep it away from the battery.
  • Next, disconnect the red (positive) cable from the positive terminal in the same way.
  • Remove any brackets or holders securing the old battery in place.
  • Carefully take out the old battery.
  • Clean any corrosion or dirt from the battery tray and terminals.
  • Place the new 12-volt battery in the tray and secure it with the brackets or holders.
  • Connect the red (positive) cable to the new battery’s positive terminal and tighten the nut.
  • Then, connect the black (negative) cable to the new battery’s negative terminal and tighten the nut.
  • Double-check that all connections are secure.
  • Close the hood.
  • Start your car to make sure everything is working correctly.

Hyundai Kona EV 12V Battery Degradation Signs

Before jumping to the battery replacement procedure, let’s first know how can you understand that your Hyundai Kona 12V Battery is Degradated. Check whether you find any match with the below signs. 

  • Dim or flickering lights
  • Slow or weak Engine start
  • Warning Lights
  • Loss of Electrical Functions
  • Unusual Sounds
  • Unpredictable Electrical Behavior
  • The difficulty of gear shifting.
  • Reduction of fuel efficiency

If the signs match with your Hyundai Kona EV. then it’s time to change your 12V battery replacement. 

Owner’s manual at a glance

Before attempting to replace your Hyundai Kona EV 12 Battery, it’s wise to consult your vehicle’s owner’s manual for specific instructions and safety precautions.

Tools and Material you’ll need during your Hyundai Kona EV 12V Battery Replacement

  • New 12V Battery -(You can find the required specification of the battery in the Owner’s Manual)
  • Socket Wrench or pliers
  • Safety Goggles
  • Gloves
  • Batter Terminal Cleaner and Protector
  • Wire Brush
  • Battery Terminal brush
  • Adjustable Wrench or pliers
  • Anti-corrosion grease (optional)

Steps to Replace the Hyundai Kona EV 12V Battery

Safety Precautions

Battery replacement is a technical task. You must take all the safety precautions to measure both your safety and your vehicle’s functionality. Follow the following steps before starting the battery replacement process. 

  • Make sure that you park your vehicle on a level surface.
  • The ignition is turned off. 
  • The key must be removed from the ignition. 
  • Wear Safety Goggles and gloves to protect yourself from battery acid and debris. 

Locate the 12V Battery 

Usually, the 12V battery in the Hyundai Kona EV is located in the engine compartment. Open the hood to access it. 

Disconnect the negative terminal

To disconnect the negative terminal successfully and safely, follow the steps I’ve given depicted below. 

  • Locate the negative battery terminal
  • Use a socket wrench or pliers to loosen 
  • Remove the nut securing the cable to the terminal
  • Once it’s loose, carefully lift the cable off the terminal
  • And secure it away from the battery to prevent any accidental contact

Remove the old 12V battery

Removing the 12V battery depends on the battery mount, you can use an adjustable wrench or pliers to loosen and remove any securing brackets or blots holding the battery in place. If you successfully removed any securing hardware, carefully lift the old battery out of its tray. 

Clean The terminal and Battery tray

It’s time to clean the terminal and battery tray. Use a wire brush and battery terminal cleaning tool to clean corrosion or any buildup from the cable terminational and battery tray. To ensure a clean connection, you can use a battery cleaner and protector. 

Install the new Hyundau12V Battery

Place your new 12V battery into the tray. Make sure it’s properly seated. Now reattached the securing brackets or bolts to hold the battery in place. Check everything you’ve done once more to be sure you’ve done it well.

Reconnect the positive terminal

Slide the positive cable back onto the positive terminal. Then tighten the nut securely. You can identify the positive cable by its red color. 

Reconnect the negative terminal

Repeat the process for the negative cable. You can recognize the negative cable by its black color.

Double-check all connections

Now it’s time double check again to ensure our process has been done well and securely.  Ensure that both the positive and negative terminals are securely connected to your new 12V battery.

Apply Anti-corrosion grease

As I mentioned earlier, This step is optional. However, applying a small amount of anti-corrosion grease to the battery terminals can help prevent any future corrosion. So, it’s your decision to make whether you want to apply it or leave it. 

Close the hood

If you’re done following all the steps, now it’s time to close the hood. Make sure you close it securely. 

Start the Vehicle

Now check it by turning on the ignition to make sure all systems are functioning correctly. 

Final Thoughts

There you go. By following all the above-mentioned steps you can replace your Hyundai Kona EV 12V battery successfully. But, if you’re uncomfortable following the steps, please see the expert’s help. A technician will replace your Hyundai Kona EV 12V battery professionally by making sure it functions well and becomes durable. If your warranty covers it, please take it Hyundai Service Center to ensure a more trusted Hyundai Kona 12V battery replacement.

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Q. How much does it cost to replace the battery in a Kona Electric car?

The cost to replace the battery in a Hyundai Kona Electric car can vary significantly but is generally in the range of $5,000 to $10,000 or more, depending on the battery’s capacity, the vehicle’s age, and the warranty coverage.

Q. Does Kona EV have a 12V battery?

Yes, the Hyundai Kona Electric (EV) has a 12-volt auxiliary battery in addition to its high-voltage traction battery.

Q. How big is the battery in the Hyundai Kona 12V?

The 12-volt auxiliary battery in a Hyundai Kona is typically a Group 47 size battery, which is a common size for many vehicles. The exact specifications may vary slightly depending on the year and trim level of the Kona.

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