How to Replace the Battery on a Hyundai Sonata

In this guide, you will find instructions on how to replace a Hyundai Sonata battery,  model years 2011-2014.

DIY Cost: $70-$150
Est. Time: 30 min
Difficulty: Easy

Symptoms of a weak or dead battery on a Hyundai are:

  • car won't start, 
  • engine turns over very slow
  • hearing a click when trying to start the engine

You may also find clues to the condition of the battery by inspecting the battery for acid built-up at the terminals. 

Check the battery terminal for looseness and the presence of corrosion. If this is the case, you may not need a new battery; you might need to clean the corrosion out and tighten the terminal nut.

What you will need

Parts

Tools

Procedure

  1. Park vehicle on level ground. Set the parking brakes and open the hood by pulling the hood release under the dashboard. 
  2. Loosen and remove 10mm battery terminal nuts.remove-nuts
  3. Remove the battery pole terminal and set it aside; always remove the negative side first.
  4. Remove battery support clamp by detaching a 12mm bolt using a socket wrench and a ratchet.remove-support-clamp

     

  5. Lift the battery out of the car.
  6. Place the new battery in the battery tray.
  7. Lock the battery in place by installing the battery clamp, secured by a 12 mm bolt. Tighten the clamp bolt.
  8. Clean the battery terminals using a battery terminal brush or sandpaper.
  9. Install the positive battery terminal first, then fasten the 10mm nut.
  10. Install the negative battery terminal, then fasten the 10mm nut.
  11. Close the positive battery insulator.
  12. Start the car.
  13. Re-check with a voltmeter; the voltage should be 13-14 volts.

Isolating the alternator problem from the battery is also a good idea; start the car and measure the voltage from the battery terminal; it should be between 13-14 volts.

Frequently Asked Questions

How Does a Car Battery Work?

  • Most, but not all, passenger vehicles on the road use what’s called a “lead-acid battery.” Inside the sturdy plastic casing are several metal plates that are surrounded by sulfuric acid. A reaction between the two takes place, which produces chemical energy. The battery then converts the chemical energy into electrical energy, which starts and powers your car.

Can My Car Battery Freeze?

  • A fully charged lead-acid battery has a freezing point of below -40F. However, if the battery is fully discharged, the vast majority of the sulfate ions inside have been consumed, and what’s left is an electrolyte solution that’s comprised mostly of water—that has a freezing point of 32F.

For those who live in cold climates to come out to your car on a freezing day, and the battery won’t accept a charge current. At this point, it will need to be warmed up before it will accept a charge. Once it’s charged up completely, it won’t freeze until it’s fully discharged again. 

How to Replace the Battery on a Hyundai Sonata Symptoms of a weak or dead battery on a Hyundai are: car won't start,  engine turns over very slow hearing a click when trying to start the engine You may also find clues to the condition of the battery by inspecting the battery for acid built-up at the terminals.