The fastest place to get a key fob battery is your car dealership or an auto parts store
You can walk into most auto parts stores—AutoZone, O'Reilly, Advance Auto Parts, NAPA—and buy a key fob battery the same day, usually for $3 to $10. The staff can often tell you which battery type your fob needs if you bring the fob with you, or you can look up your car's year, make, and model on their website first. Dealerships stock the correct battery and will install it for free or a small fee, but they typically cost more per battery and require an appointment.
Pharmacies like CVS and Walgreens also carry key fob batteries in their watch and battery sections, though selection is smaller and prices are slightly higher. Amazon and other online retailers ship batteries within a few days, but this only makes sense if you have a spare fob or can wait—you cannot drive without a working key.
Key Takeaways
- Auto parts stores sell key fob batteries for $3 to $10 and can identify which type you need while you wait.
- Dealerships charge more but will install the battery free or for a small fee, and the battery is may provide to work with your car.
- Pharmacies carry basic battery types but have fewer options and higher prices than auto parts stores.
- You need to know your battery type—usually printed on the old battery or found in your car's manual—before you shop.
- Installation takes less than five minutes and requires only a small flathead screwdriver or coin.
How to identify which battery type your fob needs
The easiest way is to open your fob and look at the battery itself. Most key fob batteries are coin-cell types labeled with a code like CR2032, CR2025, or CR2016. Write down that code and take it with you to the store, or search for it online to see which retailers have it in stock.
If you cannot open the fob or the battery is dead and unreadable, check your car's owner manual—it usually lists the battery type in the key fob section. You can also call your dealership with your car's year, make, and model, and they will tell you the correct battery without charging you. Some auto parts stores can look it up on their computer if you give them your vehicle information.
Auto parts stores: fastest and cheapest option
Stores like AutoZone, O'Reilly, Advance Auto Parts, and NAPA have key fob batteries in stock at most locations. Prices range from $3 to $8 per battery. You can call ahead or check their website to confirm they have your battery type in stock, which saves a trip if your fob uses an uncommon size.
Many auto parts stores will install the battery for free while you wait—just ask when you arrive. If they do not offer installation, the process takes under five minutes at home with a flathead screwdriver or coin. Some stores also sell multi-packs of the same battery type if you want spares, which costs less per unit than buying one at a time.
Dealerships: may provide fit and free installation
Your car's dealership will have the exact battery your fob needs and will install it at no charge or for $5 to $15. This is the safest option if you are unsure about the battery type, because the dealership cannot sell you the wrong one. The downside is that you usually need an appointment, and the battery itself may cost $5 to $12—more than an auto parts store.
Some dealerships will install a battery while you wait if you drop by during service hours, but call ahead to confirm. If you are already at the dealership for another service, ask them to replace the battery while your car is there.
Pharmacies and grocery stores: convenient but limited
CVS, Walgreens, and some grocery stores carry watch and calculator batteries in their pharmacy or electronics sections. They stock common types like CR2032 and CR2025, but selection is smaller than auto parts stores and prices are higher—usually $5 to $12 per battery. This option works if you are already shopping there and your fob uses a common battery type.
Staff at pharmacies are often less familiar with car key fobs than auto parts store employees, so they may not be able to confirm whether a battery will work for your specific fob. Bring your fob with you or know the battery code before you shop.
Online retailers: only if you can wait
Amazon, eBay, and battery specialty sites sell key fob batteries in bulk or single units, often cheaper than in-store prices. Shipping usually takes three to seven days. This makes sense only if you have a spare fob, do not need the car when ready, or want to stock up on batteries for future use.
When ordering online, double-check the battery code and read reviews to confirm the battery works with your car model. Some sellers ship counterfeit or low-quality batteries, so stick with established retailers and look for products with many positive reviews.
How to install a key fob battery yourself
Most key fobs open with a small flathead screwdriver or a coin inserted into the seam on the side or back. Gently twist or pry until the fob splits into two halves—do not force it, or you may crack the plastic. The battery sits in a small metal holder, usually held in by a spring clip on one end.
Note which side of the battery faces up (the positive side is usually marked with a plus sign), then lift out the old battery and slide the new one in with the same side facing up. Close the fob by pressing the two halves together until they click. Test the fob on your car to confirm it works. If it does not, open it again and flip the battery—you may have installed it upside down.
If your fob does not open easily or you are uncomfortable taking it apart, any auto parts store or dealership will install it for you in under five minutes.
Frequently Asked Questions
Can I use any CR2032 battery in my key fob, or does it have to be a specific brand?
Any CR2032 battery will work in a fob designed for CR2032, regardless of brand. Duracell, Energizer, and store brands all function the same way. Avoid extremely cheap batteries from unknown sellers online, as they may not hold a charge as long, but any name-brand battery from an auto parts store or pharmacy will work fine.
How long does a key fob battery last?
Most key fob batteries last three to four years with normal use. If you use your fob frequently—multiple times per day—the battery may last only two to three years. You will notice the fob working at shorter distances before the battery dies completely.
What if my key fob still does not work after I replace the battery?
The fob may have a broken button contact or circuit board damage. Try cleaning the battery contacts inside the fob with a pencil eraser or dry cloth, then reinstall the battery. If it still does not work, the fob itself may need repair or replacement—contact your dealership for a quote.
Do I need to reprogram my fob after changing the battery?
No. Replacing the battery does not erase the fob's programming. Once you install the new battery, the fob should work when ready without any reprogramming steps.
Is it cheaper to replace the battery or buy a new fob?
Replacing the battery costs $3 to $15 and takes five minutes. A new fob from a dealership costs $200 to $500 and requires programming. Always try a new battery first—it solves the problem in almost every case.