Most Jeep key fobs use a coin-cell battery you can swap yourself in under five minutes

You can replace a Jeep key fob battery without tools or a trip to the dealership. The battery sits inside a plastic case that opens by hand or with a flathead screwdriver, and the whole job takes longer to find the right battery than to install it. Jeep key fobs typically use a CR2032 or CR2025 coin-cell battery—the same type used in watches and calculators—which costs between $3 and $8 at any pharmacy, grocery store, or hardware store.

The exact steps depend on which Jeep model and year you own, because Jeep has used several different fob designs. The process is nearly identical across all of them, but the location of the seam where the fob opens varies slightly. Once you know where to look, you can open it, note which way the old battery sits, drop in the new one the same way, and close it back up.

Key Takeaways

  • Most Jeep key fobs use a CR2032 or CR2025 coin-cell battery that you can buy at any pharmacy or grocery store for $3 to $8.
  • The fob case opens by hand or with a flathead screwdriver along a seam on the edge; look for a small slot or line where the two halves meet.
  • Note which side of the battery faces up before you remove it, then install the new battery the same way to avoid a non-working fob.
  • If the fob still does not work after you install a fresh battery, the problem is likely a worn contact or a dead circuit board, not the battery itself.

Locate the seam on your fob case

The plastic case of a Jeep key fob is held together by a seam running around the edge. On most Jeep fobs, this seam runs horizontally across the middle of the fob, dividing the top half from the bottom half. On some newer models, the seam runs vertically along one side. Look at the edge of your fob and you will see a thin line where the two pieces of plastic meet; that is where you will pry it open.

If you cannot see the seam clearly, run your fingernail along the edge of the fob. You will feel a slight ridge or groove where the two halves are joined. This is the line you need to work along. Do not try to pry at the buttons or the flat face of the fob—you will crack the plastic. The seam is always on the edge.

Open the fob with a flathead screwdriver or your fingernail

Insert a flathead screwdriver into the seam and gently twist it to create a small gap between the two halves. You do not need much force—the fob is not glued together, just snapped. Once you have a gap wide enough to fit your fingernail, put the screwdriver down and use your fingers to pry the two halves apart. If the fob is stubborn, try a different spot along the seam; sometimes one side separates more easily than the other.

If you do not have a screwdriver handy, a coin edge or a plastic spoon handle can work. Avoid metal objects that are too sharp, because they can slip and scratch the plastic inside. Once the fob is open, set the two halves on a clean surface so you do not lose any small parts.

Remove the old battery and note its orientation

Inside the fob you will see the coin-cell battery sitting in a small metal holder or slot. Before you touch it, look at which side is facing up. The battery has a flat side (the negative end) and a slightly domed side (the positive end). Most Jeep fobs have the domed side facing up, but some have it facing down. Take a mental note or take a photo with your phone so you remember the orientation.

Gently pry the old battery out of its holder using your fingernail or the edge of a plastic spoon. The battery is not glued in, so it should come out with light pressure. If it is stuck, try working it from the edge rather than pushing straight up. Once it is out, set it aside—you do not need to keep it.

Install the new battery in the same orientation

Take your new CR2032 or CR2025 battery and place it in the holder with the same side facing up as the old battery. If the old battery had the domed side up, the new one should too. Press it down gently until it sits flat in the holder. You should hear or feel a small click as it settles into place. Do not force it; if it does not sit flat, you may have it upside down.

Once the battery is seated, close the fob by pressing the two halves together. Start at one end of the seam and work your way along, pressing firmly until you hear a click. The fob should snap shut with a solid feel. If it feels loose or does not close all the way, open it again and check that the battery is sitting flat and not blocking the case.

Test the fob before you put it away

Stand a few feet from your Jeep and press each button on the fob—lock, unlock, panic, trunk, or whatever buttons yours has. You should see the lights on your Jeep respond, or hear the locks click. If nothing happens, open the fob again and check that the battery is oriented correctly. Flip it over and try again; many fobs work only when the battery is installed one specific way.

If the fob still does not work after you have tried both orientations with a fresh battery, the problem is not the battery. The metal contacts inside the fob may be corroded, or the circuit board may be damaged. In that case, you will need to have the fob replaced by a Jeep dealership or a locksmith who programs key fobs.

Where to buy the right battery

CR2032 and CR2025 batteries are sold at pharmacies (CVS, Walgreens), grocery stores, hardware stores (Home Depot, Lowe's), and online retailers. They are inexpensive and usually stocked near the watch batteries or in the pharmacy section. If you are not sure which type your fob uses, open the old battery holder and look at the number printed on the battery itself. Write it down and show it to the store employee, or search for it online to confirm you are buying the right one.

Some retailers sell multi-packs of coin-cell batteries at a lower per-unit cost if you want to keep spares on hand. A single battery usually lasts three to four years in a key fob, depending on how often you use it.

Frequently Asked Questions

What if I cannot get the fob open?

Try a different spot along the seam—sometimes one side separates more easily than the other. If the fob is very tight, soak the seam in warm water for a few minutes to soften any adhesive, then try again. Avoid using excessive force, which can crack the plastic. If you still cannot open it, a locksmith or dealership can do it for you.

How do I know if my fob uses a CR2032 or CR2025?

Open the fob and look at the number printed on the old battery. The first two digits tell you the size: CR2032 is slightly thicker than CR2025. If you cannot see the old battery clearly, most Jeep fobs from the past 15 years use CR2032. When in doubt, buy CR2032—it is the most common type.

Can I use a different type of battery?

No. The fob is designed for a specific battery size and voltage. Using the wrong type can damage the circuit board or cause the fob to malfunction. Stick with the exact type printed on your old battery or recommended in your Jeep's owner manual.

Why does my new fob battery not work even though it is fresh?

The battery is probably installed upside down. Open the fob and flip the battery over, then test again. If it still does not work, the metal contacts inside the fob may be dirty or corroded. Try cleaning them gently with a dry cloth, or have the fob serviced by a locksmith or dealership.

How often do I need to replace the battery?

Most key fob batteries last three to four years with normal use. If you use your fob frequently, the battery may wear out sooner. You will know it is time to replace it when the fob stops working from a distance or requires you to press the button multiple times.