Open the Key Fob Case

Most Jeep key fobs split into two halves along a seam that runs around the edge. Look for a small slot or notch on one side of the fob—this is where you insert a flat tool to pry the case apart. A coin, flathead screwdriver, or the edge of a butter knife works well. Insert the tool gently into the slot and twist slightly; the case should pop open without force.

If your fob has no visible slot, check the back or sides for a small button or release. Some Jeep models use a button you press to separate the halves. Once you locate it, press and hold while gently pulling the two halves apart. Do not force the case—if it resists, you may be prying at the wrong spot.

When the case opens, you will see the battery sitting in a small metal holder. The battery is usually a coin-cell type, most commonly a CR2032 or CR2025. Note which side faces up—the positive side (marked with a + symbol) typically faces toward you.

Key Takeaways

  • Jeep key fob batteries are coin-cell types, usually CR2032 or CR2025, which cost between $3 and $8 at any drugstore or supermarket.
  • Open the fob case by inserting a flat tool into the seam and twisting gently; do not force it, as the plastic cracks easily.
  • Note which side of the old battery faces up before you remove it, so you install the new one the same way.
  • The entire replacement takes less than two minutes and requires no special tools beyond a coin or flathead screwdriver.

Remove the Old Battery

Once the case is open, use your fingernail or a plastic tool to lift the old battery out of its metal holder. The battery sits loosely in the holder and should come free with gentle pressure. If it is stuck, try tilting the fob slightly so the battery slides out rather than lifting straight up.

Set the old battery aside. You do not need to keep it unless you want to recycle it—many pharmacies and electronics stores have battery recycling bins near the checkout.

Install the New Battery

Before you buy a replacement, check your old battery to confirm the model number. It will be printed on the flat side and will read something like CR2032 or CR2025. Take a photo of it with your phone if you are shopping in a store, or note the number down. Buy a fresh battery of the exact same model.

Slide the new battery into the metal holder with the positive side (+) facing the same direction as the old one faced. The battery should sit flat and level in the holder. Press down gently to make sure it is seated properly.

Close the Key Fob Case

Align the two halves of the fob so the seam is even on all sides. Press them together firmly until you hear or feel a click. The case should close smoothly without gaps. If it does not close evenly, open it again and check that the battery is sitting flat in its holder—a tilted battery can prevent the case from closing properly.

Once closed, test the fob by pressing each button. You should hear a beep or see the lights on your Jeep respond. If nothing happens, open the case again and check that the battery is installed with the correct side facing up.

What Battery Type Your Jeep Uses

The most common battery for Jeep key fobs is the CR2032, a 3-volt coin cell that is 20 millimeters wide and 3.2 millimeters thick. Some older Jeep models use the CR2025, which is the same width but slightly thinner. A few specialty fobs may use CR2016 or CR2020, but these are less common.

If you are unsure which type your fob needs, open the case and look at the old battery. The model number is printed clearly on the flat side. You can also check your Jeep's owner manual, though the battery type is usually not listed there. When in doubt, take the old battery to a pharmacy or supermarket and match it to a new one.

Where to Buy Replacement Batteries

Coin-cell batteries are sold almost everywhere: pharmacies like CVS and Walgreens, supermarkets, hardware stores, and dollar stores all stock them. You can also order them online from Amazon or other retailers. A single battery usually costs between $3 and $8, though buying a pack of two or four is often cheaper per battery.

Do not buy batteries from gas stations or convenience stores unless you have no other option—they are usually more expensive and may be older stock. Batteries have no expiration date, but fresher stock is always safer. Check the packaging to make sure the battery is sealed and has not been opened.

Common Mistakes to Avoid

The most common error is installing the battery upside down. If your fob stops working after you replace the battery, open the case and flip the battery 180 degrees. The positive side (marked +) must face outward toward the button side of the fob.

Another mistake is forcing the case open too hard. The plastic is thin and cracks easily if you pry too aggressively. If the case does not open after gentle pressure, try a different spot along the seam—you may be prying at a reinforced area.

Do not mix battery types. If your fob uses a CR2032, do not substitute a CR2025 or any other model. The wrong size may not make contact with the holder, or it may fit so loosely that it loses power when you press a button.

Frequently Asked Questions

How long does a Jeep key fob battery last?

Most coin-cell batteries last three to four years with normal use. If you use your fob frequently—pressing buttons multiple times a day—the battery may last only two to three years. If you use it rarely, it may last longer. A battery that dies suddenly after only a few months may be defective; try a fresh battery from a different brand or store.

What if my key fob still does not work after I replace the battery?

First, check that the battery is installed with the positive side facing up. If it is, try a different new battery—the one you bought may be defective. If a second battery does not work, the fob itself may be damaged. Water damage, a cracked circuit board, or worn button contacts can prevent the fob from working even with a fresh battery. In that case, you will need a replacement fob from a Jeep dealer or a third-party supplier.

Can I use a rechargeable battery in my key fob?

Rechargeable coin-cell batteries exist, but they are not recommended for key fobs. Rechargeable batteries have a lower voltage than standard alkaline batteries and may not provide enough power to reliably unlock your Jeep. Stick with standard alkaline CR2032 or CR2025 batteries for consistent performance.

Do I need to reprogram my Jeep after replacing the battery?

No. Replacing the battery does not erase any programming. Your fob will work exactly as it did before once the new battery is installed. You only need to reprogram a fob if you have lost the original programming or if you are using a brand-new fob that has never been paired to your Jeep.