You can replace a Hyundai key fob battery yourself in about two minutes

Most Hyundai key fobs use a coin-cell battery — typically a CR2032 or CR2025 — that you can buy at any drugstore, grocery store, or hardware store for a few dollars. The fob itself opens with a flat tool (a coin works fine), and the battery slides out and in without any special knowledge. The whole job takes longer to find the right battery than to do the swap.

The exact battery type depends on your fob model and year, so you will need to check either the fob itself or your owner's manual before you buy. Once you have the right battery, the physical replacement is the same across nearly all Hyundai models.

Key Takeaways

  • Hyundai key fobs use coin-cell batteries, most commonly CR2032 or CR2025, available at any pharmacy or grocery store.
  • You open the fob by inserting a flat tool (a coin, flathead screwdriver, or plastic pry tool) into the slot on the edge and gently twisting.
  • The battery sits in a small metal holder and slides out horizontally — note which side faces up before you remove it.
  • New batteries cost between $3 and $8, and the entire replacement takes about two minutes once you have the right battery in hand.

Find out what battery your fob needs

Check the inside of your key fob first. Once you open it (see the next section), the battery holder usually has the battery type printed or stamped on it — you will see something like "CR2032" or "CR2025". Write this down or take a photo before you close the fob again.

If the printing is worn off or unreadable, check your Hyundai owner's manual. The key fob section will list the battery type. You can also call your Hyundai dealer with your vehicle's year, make, and model, and they will tell you the correct battery in seconds.

Do not guess. Buying the wrong size battery means a wasted trip back to the store and a fob that does not work. The CR2032 and CR2025 look nearly identical but are different thicknesses, and a CR2025 will not sit properly in a CR2032 holder.

Open the key fob safely

Look at the edge of your fob for a small slot or seam running around the perimeter. This is where the two halves of the plastic case meet. Insert a flat tool — a coin, a flathead screwdriver, or a plastic pry tool — into that slot.

Gently twist the tool to separate the two halves. Do not force it. If the fob does not budge after light pressure, you may be in the wrong spot; rotate the fob and try a different section of the seam. Once you feel it start to give, work your way around the edge, twisting a little at each point, until the two halves come apart.

Set the two halves on a clean surface with the battery holder facing up. The battery will be sitting in a small metal clip or holder in the center of one half.

Remove and replace the battery

Look at how the battery is oriented — which side faces up — before you touch it. The positive side (marked with a + symbol) usually faces up, but note this so you can put the new battery in the same way.

Slide the battery out of its metal holder horizontally. It should come out with gentle pressure; if it is stuck, you may be pushing at the wrong angle. Once it is out, drop the new battery into the holder with the positive side facing the same direction as the old one.

The battery should sit flat and flush in the holder. If it is loose or sits at an angle, you may have the wrong battery size. Remove it and double-check the type before proceeding.

Close the fob and test it

Press the two halves of the fob back together, starting at one edge and working around until they snap into place. You should hear or feel a click when they are fully seated. Do not force them; if they do not come together smoothly, one half may be slightly misaligned — separate them and try again.

Stand a few feet away from your Hyundai and press the lock and unlock buttons on the fob. You should see the lights flash and hear the locks respond. If nothing happens, open the fob again and check that the battery is seated correctly and facing the right direction.

If the fob still does not work after you have confirmed the battery is in correctly, the problem may be something other than the battery — a broken button contact or internal damage. In that case, contact your Hyundai dealer about a replacement fob.

Where to buy the right battery

Coin-cell batteries are stocked everywhere: pharmacies (CVS, Walgreens), grocery stores, hardware stores (Home Depot, Lowe's), and big-box retailers (Target, Walmart). They are usually in the electronics or watch section, near the checkout, or in a battery aisle.

You can also order them online through Amazon or the retailer's website if you prefer. Prices are consistent across retailers — usually $3 to $8 for a single battery, sometimes cheaper if you buy a multi-pack. Bring the battery type (CR2032, CR2025, etc.) with you or have it written down so you grab the right one.

Frequently Asked Questions

How long does a key fob battery last?

Most coin-cell batteries last between three and four years of normal use, though this varies based on how often you press the buttons. If your fob stops working suddenly, the battery is the most common culprit. Some fobs will give you a warning — the buttons may feel less responsive or work only from shorter distances — before the battery dies completely.

Can I use a rechargeable battery in my Hyundai key fob?

Rechargeable coin-cell batteries exist, but they are not recommended for key fobs. They have a lower voltage than standard batteries and may not provide enough power to reliably trigger the lock and unlock functions. Stick with a standard disposable CR2032 or CR2025.

What if I drop the battery or lose it while replacing it?

Coin-cell batteries are small and straightforward to lose. If you drop it, look on the floor and under nearby furniture when ready — they roll easily. If you cannot find it, you will need to buy another one. Keep the fob halves separated on a clean, flat surface to reduce the chance of losing parts.

Do I need to reprogram my fob after changing the battery?

No. Changing the battery does not erase any programming. Once you install the new battery and close the fob, it should work exactly as it did before. If it does not work after the battery swap, the issue is likely that the battery is installed incorrectly or the wrong type was used.

What should I do with the old battery?

Most retailers that sell batteries also accept old batteries for recycling — ask at the customer service desk. You can also check Earth911.com or call your local waste management to find a battery recycling location near you. Do not throw batteries in the trash.