Replace the battery yourself in five minutes with a coin
You can replace a Hyundai key fob battery without tools or a trip to the dealer. Most Hyundai fobs use a CR2032 battery, which costs $3 to $8 at any drugstore, grocery store, or online retailer. The whole job takes about five minutes once you have the battery in hand.
The process is the same across most Hyundai models from the past decade: you pry open the fob with a coin, slide out the old battery, and slide in the new one. No programming is required after you replace it — the fob will work when ready.
Key Takeaways
- Hyundai key fobs almost always use a CR2032 battery, which you can buy at any pharmacy or supermarket for a few dollars.
- You open the fob by inserting a coin into the slot on the edge and twisting gently until the two halves separate.
- The battery slides out of its holder; note which side faces up before you remove it so you can install the new one the same way.
- After you insert the new battery, snap the fob halves back together and test the buttons — no reprogramming is needed.
- If the fob still does not work after a new battery, the problem is likely a broken button contact or circuit board, not the battery itself.
What battery your Hyundai fob needs
The vast majority of Hyundai key fobs use a CR2032 coin cell battery. This is a round, flat battery about the size of a dime. You can confirm this by looking at the battery itself once you open the fob, or by checking your owner's manual.
Some older Hyundai models or specialty fobs may use a CR2025 or CR2016 instead, but CR2032 is by far the most common. If you are unsure, buy a CR2032 — it is the standard size, and you can return it if it does not fit. The battery costs between $3 and $8 depending on where you buy it and how many come in the pack.
How to open your Hyundai key fob
Look at the edge of your fob for a small slot or seam running along the side. This is where the two halves of the fob meet. Insert a coin — a penny, dime, or quarter works — into the slot and twist gently, as if you were opening a battery compartment on a toy or remote control.
The fob will separate into two plastic halves. Do not force it; if it is not budging after a gentle twist, you may be twisting in the wrong direction or the slot may be on a different edge. Once the halves are apart, you will see the battery sitting in a small metal or plastic holder in the center.
Remove the old battery and install the new one
Before you touch the old battery, note which side is facing up — the side with the + symbol or the side with no marking. This matters because the battery only works one way. Gently pry the old battery out of its holder with your fingernail or the edge of the coin.
Take the new CR2032 battery and insert it into the holder with the same side facing up as the old one was. The battery should sit flat and snug in the holder. If it is loose or does not sit flat, you may have the wrong size battery or the holder may be damaged.
Close the fob and test it
Press the two halves of the fob back together until you hear or feel a click. The fob should close completely with no gap between the halves. Press each button on the fob — lock, unlock, panic, trunk release, or whatever buttons your model has — and listen for the click sound that means the fob is sending a signal.
Walk to your Hyundai and test the buttons from a few feet away. The doors should lock and unlock normally. If the fob works, you are done. If it does not work after a new battery, the problem is usually a broken button contact, a cracked circuit board inside the fob, or a receiver issue with the car itself, not the battery.
Where to buy a CR2032 battery
CR2032 batteries are sold everywhere. Check the pharmacy or health and beauty section of any drugstore, grocery store, or supermarket. Walmart, Target, CVS, Walgreens, and Rite Aid all stock them. You can also order them online from Amazon, eBay, or the websites of those same retailers.
Batteries often come in multipacks of two, four, or more, which can be cheaper per battery than buying a single one. Since key fob batteries last several years, buying a multipack means you will have spares on hand when your other fobs need replacement.
What to do if the fob still does not work
If you installed a new battery and the fob buttons still do not respond, the battery was not the problem. The most common culprit is a worn or corroded button contact — the small metal dome under each button that completes the circuit when you press it. These wear out over time and cannot be replaced without replacing the entire fob.
Less often, the circuit board inside the fob has cracked or corroded, or the receiver in your Hyundai has stopped working. In either case, you will need a replacement fob from a Hyundai dealer or a third-party fob programmed to your car. A dealer fob typically costs $200 to $400 including programming; third-party fobs are often cheaper but may require a visit to a locksmith or dealer to program.
Frequently Asked Questions
How long does a CR2032 battery last in a key fob?
A CR2032 typically lasts three to four years in a key fob, depending on how often you use it. If you press the buttons dozens of times a day, the battery may wear out faster. If you use the fob only occasionally, it may last longer.
Can I use a different battery size if I cannot find a CR2032?
No. CR2025 and CR2016 are slightly thinner and will not sit securely in a CR2032 holder. Using the wrong size can cause the fob to malfunction or the battery to fall out. Stick with CR2032 unless your manual specifically says otherwise.
Do I need to reprogram my key fob after replacing the battery?
No. The battery replacement does not erase any programming. Once you install the new battery and close the fob, it will work when ready without any additional steps.
What if my key fob is wet or damaged?
If the fob has been submerged or is visibly wet, let it dry completely for 24 to 48 hours before opening it. If the fob is cracked or the battery compartment is corroded, a new battery will not fix it — you will need a replacement fob from your dealer or a locksmith.
Can I buy a replacement fob online and program it myself?
Some third-party fobs can be programmed by the owner using a sequence of steps described in the fob's instructions, but this varies by model and fob brand. Most Hyundai fobs require a dealer or locksmith to program. Check the fob listing or instructions before you buy to see if self-programming is an option.