You can replace a Jeep key fob battery yourself in under five minutes
Most Jeep key fobs use a coin-cell battery — usually CR2032 or CR2025 — that you can swap out without tools or a trip to the dealer. The fob splits open along a seam, the old battery slides out, and a new one slides in. The whole job takes longer to find the seam than to do the work. You will spend $3 to $8 on a replacement battery at any pharmacy, grocery store, or hardware store.
The exact steps depend slightly on your Jeep model year and fob design, but the principle is the same across all of them: locate the slot or seam, gently pry the fob apart, note which side the battery sits on, remove it, and insert the new one with the positive side facing up.
Key Takeaways
- Jeep key fobs almost always use CR2032 or CR2025 coin-cell batteries, which cost $3 to $8 and are sold at pharmacies and grocery stores.
- The fob splits along a seam or slot — look for a thin line running around the edge or a small notch where you can insert a fingernail or plastic tool.
- Once open, the battery sits in a small metal holder; note which side faces up before you remove it, then insert the new battery the same way.
- If the fob still does not work after the battery swap, the problem is usually a dirty contact or a worn circuit board, not the battery itself.
Finding the seam and opening the fob
Look at the edge of your key fob for a thin line or slot running around the perimeter. Most Jeep fobs have a seam that runs horizontally across the middle, dividing the fob into two halves. Some models have a small notch or indent on one edge where you can catch a fingernail or the edge of a coin.
Once you spot the seam, insert a fingernail, a plastic spoon, or a coin into the slot and gently twist or pry. Do not force it — the fob is plastic and will crack if you lever too hard. A gentle rocking motion usually works better than a single hard push. The two halves will separate with a small click.
If your fob has a notch but no obvious seam, try inserting a flathead screwdriver or a plastic pry tool into the notch and twisting gently. Some Jeep fobs also have a small screw on the back; if you see one, unscrew it first before you try to pry the halves apart.
Identifying and removing the old battery
Once the fob is open, you will see a small metal holder or clip holding a round, flat battery. The battery is usually silver or gold and about the size of a dime. Look at which side is facing up — this matters, because the new battery must go in the same way.
The positive side of the battery (marked with a +) should face up in most Jeep fobs, though some models reverse this. Take a photo with your phone before you remove the old battery, so you have a reference if you forget which way it goes.
Gently slide or pry the battery out of its holder. It may be held loosely or may require a small amount of pressure. Once it is out, check the metal contacts inside the holder — if they look dark, corroded, or dirty, wipe them clean with a dry cloth or a pencil eraser before you insert the new battery.
Installing the new battery
Buy a replacement battery that matches the number on the old one — CR2032 is by far the most common in Jeep fobs, but check the old battery to be sure. These batteries are sold at CVS, Walgreens, Target, Walmart, and most grocery stores in the pharmacy or watch section. A pack of two or four costs $4 to $8.
Slide the new battery into the holder with the positive side facing the same direction as the old one faced. You should hear or feel a small click as it seats. Do not force it — if it does not slide in smoothly, you may have the polarity backwards. Flip it and try again.
Once the battery is in place, press the two halves of the fob back together. You will hear a click when they snap together. Test the fob by pressing each button — the lights should come on and the car should lock and unlock from a normal distance.
What to do if the fob still does not work
If the fob does not respond after the battery swap, the problem is usually not the battery. The metal contacts inside the fob may be corroded or dirty, or the circuit board may be worn. Open the fob again and clean the metal contacts with a pencil eraser or a dry cloth, then test again.
If cleaning does not help, try the battery in a different fob if you have one — this tells you whether the battery is actually good. If the new battery works in another fob, your original fob has an internal problem and will need to be replaced. If the new battery does not work in any fob, return it to the store and try a different brand.
A replacement Jeep key fob costs $150 to $300 from a dealer, or $30 to $80 from an aftermarket seller online. Before you buy a new one, confirm that the problem is the fob itself and not your car's receiver — if multiple fobs stop working at the same time, the issue may be with the vehicle.
Choosing the right replacement battery
The two most common batteries for Jeep key fobs are CR2032 and CR2025. The number refers to the size: CR2032 is 20 millimeters in diameter and 3.2 millimeters thick, while CR2025 is 20 millimeters in diameter and 2.5 millimeters thick. They look almost identical and cost the same, but they are not interchangeable — using the wrong one may cause the fob to not fit together properly or the battery to make poor contact.
Check the old battery before you buy a new one. The model number is printed on the flat side. If you cannot read it, take the old battery to a pharmacy or electronics store and ask the staff to identify it. You can also search your Jeep model year and "key fob battery" online to find the correct type.
Buy name-brand batteries from Energizer, Duracell, or Panasonic rather than generic store brands. They cost a dollar or two more but last longer and are less likely to leak or fail early. A single battery usually lasts three to four years in a key fob, depending on how often you use it.
Frequently Asked Questions
Can I use any CR2032 battery, or does it have to be a specific brand?
Any CR2032 will work, but name brands like Energizer and Duracell are more reliable and less likely to leak. Store brands work too, but they may not last as long. The price difference is usually $1 to $2, so the name brand is worth it.
What if I cannot get the fob open without breaking it?
Stop and try a different approach. Use a plastic tool instead of metal — a plastic spoon, a credit card edge, or a plastic pry tool is less likely to slip and crack the plastic. If the fob has a screw, unscrew it first. If you still cannot open it, a dealer or locksmith can do it for $10 to $20.
How do I know which side of the battery goes up?
The positive side (marked with a +) usually faces up, but take a photo of the old battery in place before you remove it. If you forget, you can always flip it and test — the fob will not work if the polarity is backwards, but it will not damage anything.
Why does my new battery not work even though it is the right type?
The metal contacts inside the fob may be dirty or corroded. Open the fob again and clean the contacts with a pencil eraser or a dry cloth. If that does not work, the circuit board may be damaged, and you will need a replacement fob.
How long does a key fob battery last?
A CR2032 or CR2025 battery typically lasts three to four years in a key fob, depending on how often you press the buttons. If you use the fob several times a day, it may last only two years. If you use it rarely, it may last five years or more.