Open the remote and locate the battery

Most car remotes split open along a seam running around the edge. Look for a small slot or notch on the side of the remote — this is where you insert a flat tool to pry the two halves apart. A flathead screwdriver, coin, or even a butter knife works. Insert it gently into the slot and twist slightly; the plastic will separate without much force.

Once the remote is open, you will see a small coin-shaped battery sitting in a plastic holder. The battery has a number printed on top — something like CR2032, CR2025, or LR44. Write down this number or take a photo with your phone. This is the exact battery you need to buy.

Before you remove the old battery, notice which side is facing up. The positive side (marked with a + sign) should be facing toward you. This matters when you put the new one in.

Key Takeaways

  • Car remote batteries are coin-shaped and cost between $3 and $8 at any pharmacy, grocery store, or hardware store.
  • The battery number is printed on the old battery itself — CR2032 and CR2025 are the most common types.
  • The positive side of the battery must face upward when you insert it, or the remote will not work.
  • The entire job takes about two minutes once you have the new battery in hand.
  • If the remote still does not work after replacing the battery, the problem is usually a stuck button or corroded contacts inside the remote.

Buy the correct replacement battery

Take the battery number to any pharmacy, supermarket, or hardware store. Walgreens, CVS, Walmart, Target, and Home Depot all stock these batteries in their watch and battery sections. You can also order them online from Amazon or eBay if you prefer, though you will wait for shipping.

The battery costs between $3 and $8 depending on the brand and where you shop. Name brands like Energizer and Duracell cost more than store brands, but they perform the same way. A generic battery will work just as well as an expensive one.

If you are not sure which number you need, bring the old battery with you or show the store clerk a photo. They can match it on the spot.

Remove the old battery and insert the new one

Gently pry the old battery out of its plastic holder using your fingernail or a plastic tool. Do not use a metal screwdriver — you could damage the contacts inside the remote. The battery should come out easily with light pressure.

Place the new battery into the holder with the positive side (the + mark) facing upward, toward the top of the remote. Press down gently until you hear or feel a small click. The battery should sit flat and snug in the holder.

If the battery does not sit flat or feels loose, remove it and check that you have inserted it the right way. The positive side must face up. If it still feels loose after you flip it, the holder may be worn out, but the remote will usually still work.

Close the remote and test it

Line up the two halves of the remote so the seam matches up evenly. Press down firmly along the edges until you hear a click or feel the plastic snap back into place. Start at one end and work your way around the remote to make sure both halves are seated properly.

Point the remote at your car and press a button — the lock or unlock button works best. You should see the car's lights flash or hear the locks click. If nothing happens, open the remote again and check that the battery is sitting flat with the positive side facing up.

If the remote still does not work after you have checked the battery twice, the problem is likely inside the remote itself. Stuck buttons or corroded metal contacts are the most common causes. In that case, you may need a new remote from your car's dealership or an aftermarket remote from an auto parts store.

What to do if the remote still does not work

Before you assume the remote is broken, try cleaning the battery contacts. Open the remote again and look at the small metal springs or contacts where the battery sits. If they look dark, dirty, or corroded, rub them gently with a clean, dry cloth or a pencil eraser. Corrosion can prevent the battery from making good contact.

Also check the rubber button pad inside the remote. If the buttons feel sticky or do not spring back when you press them, the pad may be worn out. You can sometimes clean it with rubbing alcohol on a cotton swab, but if the buttons are permanently stuck, the remote will need to be replaced.

If the battery is new, the contacts are clean, and the buttons work, but the remote still does not control your car, the problem may be with your car's receiver rather than the remote itself. Try the spare remote if you have one. If the spare works, your original remote is faulty. If the spare does not work either, your car's receiver may need service from a dealership.

How long a car remote battery lasts

Most car remote batteries last between three and four years with normal use. If you use your remote multiple times every day, the battery may wear out faster — sometimes in two years. If you use it only a few times a week, it may last longer.

You will know the battery is dying when the remote stops working from a distance and only works when you hold it very close to the car. This is the first sign that the battery voltage is dropping. Once you see this, replace the battery within a few days, because the remote may stop working completely without warning.

Keep a spare battery in your car or at home so you are not stuck if the remote dies when you are away from a store. Since they cost so little, buying an extra one when you replace the current battery is a smart habit.

Frequently Asked Questions

Can I use a different battery type if I cannot find the exact number?

No — use the exact battery number printed on the old battery. CR2032 and CR2025 look almost identical but have different thicknesses, and using the wrong one can damage the remote or prevent it from working. If your store is out of stock, order online or try another store rather than substituting.

What if I put the battery in upside down?

The remote straightforward will not work. The positive and negative sides must match the holder's design. If you inserted it upside down, the remote will be completely dead. Open it, flip the battery, and try again — no damage will occur from one wrong attempt.

Do I need to reprogram my remote after changing the battery?

No. Changing the battery does not erase any programming. Your remote will work exactly as it did before, with all of its buttons functioning normally. You only need to reprogram a remote if you have lost the code or replaced the entire remote unit.

Is it safe to throw the old battery in the trash?

Car remote batteries are small and contain minimal hazardous material, so throwing them in household trash is generally safe. However, many stores that sell batteries also accept old ones for recycling at no charge. Check with your local pharmacy or hardware store about their battery recycling program if you prefer not to throw it away.

Why does my remote work sometimes but not other times?

This usually means the battery is dying and voltage is dropping. Replace it with a fresh battery. If the new battery has the same problem, the issue is likely a loose or corroded contact inside the remote, or a button that is sticking. Clean the contacts with a dry cloth and check that all buttons move freely.