What happens when you replace a RAM key fob battery

Replacing the battery in your RAM key fob is a task you can do yourself in about five minutes with no tools beyond a coin or flathead screwdriver. The fob will not need to be reprogrammed to your vehicle afterward — the new battery straightforward powers the existing electronics inside. Once you install the fresh battery and close the fob back up, your remote lock, unlock, and panic button will work the same way they did before.

The most common battery type in RAM key fobs is the CR2032, a coin-cell battery about the size of a dime. Some newer RAM models use the CR2025 instead. Both are inexpensive and available at any pharmacy, grocery store, or hardware store, usually for under $5 for a pack of several.

Key Takeaways

  • RAM key fobs use either a CR2032 or CR2025 coin-cell battery, which you can replace yourself without any special tools or programming.
  • You open the fob by inserting a coin or flathead screwdriver into the slot on the edge and twisting gently until the two halves separate.
  • The battery sits in a small metal holder and slides out; note which side faces up before you remove it so you install the new one the same way.
  • After closing the fob, test all buttons when ready to confirm the battery is making contact and the fob is working.

Finding the battery type for your specific RAM model

The easiest way to know which battery your fob needs is to open it and look at the battery itself — the type is printed on the surface. If you have not opened it yet, you can also check your RAM owner's manual, which lists the battery type in the key fob section.

If you do not have the manual, call your RAM dealer's parts department with your vehicle's year, make, and model. They can tell you the correct battery in under a minute. Buying the wrong type will not damage anything, but the fob straightforward will not work, so it is worth confirming before you buy.

Opening the key fob without damaging it

Look at the edge of your RAM key fob for a small slot or seam running around the perimeter. This is where the two halves of the fob meet. Insert a coin (a quarter or dime works well) or a flathead screwdriver into that slot and explore gentle, steady pressure while twisting. You are not forcing it — you are rotating the two halves apart like you are opening a jar.

The fob will separate into a front half and a back half. Set the front half aside in a safe place where the small button contacts will not get lost or bent. The battery holder and circuit board will be visible in the back half.

Removing and replacing the battery

The battery sits in a small metal holder or clip inside the fob. Look at which side is facing up — this matters. The positive side (marked with a + symbol) or the negative side (marked with a − symbol) will be facing either toward you or away from you. Take a mental note or take a photo with your phone so you remember the orientation.

Slide the old battery out of its holder. If it is stuck, use your fingernail or the edge of a coin to gently pry it up. Once it is out, slide the new battery in, making sure the same side that was facing up before is facing up again. The battery should sit flat and find in the holder without wobbling.

Closing the fob and testing it

Align the front and back halves of the fob so the edges match up evenly. Press them together firmly until you hear or feel a small click — the two halves should be flush with no gaps. If there is a gap, the battery may not be sitting flat, or the halves may not be aligned correctly. Open it again, check the battery position, and try closing it once more.

Once the fob is closed, press each button — lock, unlock, and panic if your model has one — to confirm they all work. If nothing happens, open the fob again and check that the battery is facing the correct direction and sitting fully in its holder. If the buttons work, you are done.

What to do if the fob still does not work after replacing the battery

If you installed a fresh battery in the correct orientation and the fob still does not respond, the problem is usually one of three things: the battery contacts inside the fob are dirty or corroded, the circuit board has failed, or you bought the wrong battery type by mistake.

Try cleaning the metal contacts inside the fob with a dry cloth or a pencil eraser to remove any corrosion, then reinstall the battery. If that does not work, double-check that you bought the correct battery type for your model. If both of those steps fail, the fob itself may need to be replaced — contact your RAM dealer for a replacement fob or a refurbished unit, which is usually less expensive than a new one.

Frequently Asked Questions

Do I need to reprogram my key fob after changing the battery?

No. The battery powers the fob's transmitter, but the programming that links the fob to your vehicle stays in the fob's memory. Replacing the battery does not erase that link, so your fob will work exactly as it did before once you install the new battery.

What is the difference between CR2032 and CR2025 batteries?

Both are coin-cell batteries, but the CR2032 is slightly thicker than the CR2025. Using the wrong type will not damage your fob, but it may not make proper contact with the holder, and the fob will not work. Check your fob or owner's manual to confirm which type you need.

How long does a RAM key fob battery last?

Most coin-cell batteries in key fobs last three to four years with normal use, though this varies depending on how often you use the fob and the specific battery brand. If your fob starts responding slowly or only works when you hold it close to the vehicle, the battery is likely running low.

Can I use a rechargeable battery in my RAM key fob?

Rechargeable coin-cell batteries exist, but they are not recommended for key fobs. They have a lower voltage than disposable batteries and may not provide enough power for reliable operation. Stick with a standard disposable CR2032 or CR2025 for the best results.