Open the key fob case to access the battery

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

Once the case is open, you'll see the battery sitting in a small metal holder or clip. The battery is usually a coin-cell type, most commonly a CR2032, CR2025, or CR2016. The numbers refer to the battery's size and capacity. Your specific Jeep model year determines which type you need—check your owner's manual or the old battery itself for the correct number.

Key Takeaways

  • Jeep key fobs typically use a coin-cell battery (CR2032, CR2025, or CR2016) that you can find at any drugstore, supermarket, or hardware store for $3 to $8.
  • The fob case opens by inserting a flathead screwdriver or coin into a slot on the edge and twisting gently until the two halves separate.
  • Note which side of the battery faces up before you remove it, then insert the new battery the same way to avoid reversing the polarity.
  • After closing the fob, test all buttons to confirm the battery is making contact and the fob is working before you rely on it.

Remove the old battery and note its orientation

Before you pull the old battery out, take a moment to see which side is facing up. Coin-cell batteries have a flat positive side and a slightly raised negative side. Most Jeep fobs have the positive side facing up, but this varies by model. A quick photo with your phone is the easiest way to remember.

Gently lift the battery out of its holder. If it's stuck, use your fingernail or a plastic tool to nudge it free—avoid metal tools that could scratch the circuit board. Once it's out, you can dispose of it at a battery recycling location or drop it off at a retailer that accepts used batteries, such as Best Buy or Lowe's.

Insert the new battery with the correct side facing up

Place the new battery into the holder with the same orientation as the old one. If the positive side was facing up before, the positive side of the new battery should face up now. The battery should sit flat and click or snap into place. If it doesn't sit flush, you've likely reversed it—flip it over and try again.

Do not force the battery into the holder. If it resists, remove it and check that you have the right size and orientation. Forcing a battery can damage the clip or the circuit board underneath.

Close the fob case and test the buttons

Align the two halves of the fob so the seam is even all the way around. Press them together firmly until you hear or feel a click. The case should close flush with no gaps. If there's a gap, the battery may not be sitting properly—open the fob again and reseat it.

Once the case is closed, press each button on the fob—lock, unlock, panic, trunk release, or whatever buttons yours has. The lights inside the fob should flash, and your Jeep should respond. If nothing happens, open the fob again and check that the battery is making contact with both the clip and the circuit board. If the battery is seated correctly and the fob still doesn't work, the circuit board may be damaged, and you'll need to replace the entire fob.

Where to buy a replacement battery

Coin-cell batteries are sold almost everywhere. Drugstores like CVS and Walgreens, supermarkets, hardware stores, and big-box retailers all stock them in the electronics or watch section. You can also order them online from Amazon or eBay. A single battery costs $3 to $8, and a pack of two or four costs only slightly more, so buying extras is practical.

When you buy, confirm the battery number matches what you found in your fob. The packaging will clearly show the model number (CR2032, for example). If you're unsure, bring the old battery with you or take a photo and show it to a store employee.

When to replace the battery versus the whole fob

A battery replacement solves the problem if the fob worked fine until the buttons stopped responding or the lights stopped flashing. If the fob was already acting erratic—buttons working only sometimes, or the fob working only when held at a certain angle—the circuit board may be failing, and a new battery won't fix it.

If the case is cracked, water-damaged, or the buttons are stuck or broken, replacing the battery won't help. In those cases, you need a new fob. Jeep dealerships sell replacement fobs, and you can also find aftermarket fobs online. Dealership fobs are more expensive but come pre-programmed for your vehicle. Aftermarket fobs are cheaper but usually require programming at a dealership or by a locksmith, which adds to the cost.

Frequently Asked Questions

What if I don't know which battery my Jeep fob uses?

Check your owner's manual, which usually lists the battery type in the key fob section. You can also open the fob and look at the old battery—the model number is printed on it. If you've already thrown away the old battery, take the fob to a drugstore or hardware store and ask an employee to identify it by looking at the holder inside the fob.

Can I use a different battery size if I can't find the exact one?

No. Different coin-cell batteries have different thicknesses and voltages. Using the wrong size can prevent the battery from making contact, damage the clip, or cause the fob to malfunction. Stick with the exact model number your fob requires.

How often do I need to replace the battery?

Most Jeep key fob batteries last two to four years, depending on how often you use the fob. If you use it multiple times a day, the battery may wear out sooner. If you use it rarely, it may last longer. When the buttons stop responding or the lights dim, it's time to replace it.

Is it safe to replace the battery myself, or should I go to a dealership?

Replacing the battery yourself is safe and straightforward. You don't need any special tools or training. A dealership will do it for you, but they'll charge a service fee—usually $20 to $50—plus the cost of the battery. Doing it yourself takes five minutes and costs just a few dollars.

What should I do if the fob still doesn't work after I replace the battery?

First, open the fob again and make sure the battery is seated properly and facing the right direction. Press down on the battery to confirm it's making contact. If it's positioned correctly and the fob still doesn't work, the circuit board is likely damaged. You'll need to replace the entire fob at a dealership or through an aftermarket supplier.