Key fob batteries typically cost between $3 and $10 per battery at most retailers
A single replacement battery for a car key fob costs $3 to $10 depending on the battery type, where you buy it, and whether you need the fob opened professionally. The most common types—CR2032, CR2025, and CR2016—are the cheapest option and usually run $3 to $6 at drugstores, supermarkets, or online. Specialty batteries or buying from a car dealership can push the price to $8 to $10, though dealerships sometimes charge an additional labor fee of $25 to $75 if they open and replace the battery for you.
The actual battery itself is inexpensive because these are standard coin-cell batteries used in many devices beyond car fobs. The cost difference comes down to where you shop and whether someone else does the work. A pharmacy or grocery store will have the lowest prices. A car dealership will charge more but offers the advantage of handling the replacement if your fob is difficult to open or if you are unsure which battery type your fob needs.
Key Takeaways
- Standard coin-cell batteries for key fobs (CR2032, CR2025, CR2016) cost $3 to $6 at drugstores and supermarkets.
- Dealerships charge $8 to $10 for the battery plus $25 to $75 in labor if they open and install it for you.
- You can replace the battery yourself in most fobs by prying open the case with a coin or flathead screwdriver, which takes two minutes and costs nothing beyond the battery.
- The battery type is usually printed on the inside of your fob case or in your vehicle's owner manual, so check before you buy.
How to find the right battery type for your fob
Before you buy, you need to know which battery your fob uses. Open the fob by inserting a coin or flathead screwdriver into the seam and gently twisting until the case splits. The battery will be sitting in a small metal holder, and the type number is printed directly on it—usually something like CR2032, CR2025, or CR2016. Write down that number or take a photo.
If your fob is difficult to open or you do not want to risk damaging it, check your vehicle's owner manual. The manual usually lists the battery type in the key fob section or in the maintenance chapter. You can also call your car dealership with your vehicle's year, make, and model, and they will tell you the battery type without charging you.
Where to buy key fob batteries at the lowest price
Drugstores and supermarkets stock coin-cell batteries in their pharmacy or electronics aisles and usually have the lowest prices. CVS, Walgreens, Target, and Walmart typically sell CR2032 batteries for $3 to $5 per battery. These retailers often run sales or have loyalty discounts that can lower the price further.
Online retailers like Amazon sell batteries in bulk at lower per-unit prices if you buy a pack of four or more, though you will pay for shipping unless you have a membership. Specialty battery retailers and electronics stores like Best Buy carry a wider range of battery types but usually charge more than supermarkets. Car dealerships have the battery in stock and can install it when ready, but expect to pay $8 to $10 for the battery alone plus labor.
Replacing the battery yourself versus paying for installation
Most car key fobs are designed to be opened and replaced by the owner without tools or special knowledge. Insert a coin or flathead screwdriver into the seam between the two halves of the fob and twist gently until the case pops open. Remove the old battery, note which side was facing up, and insert the new battery the same way. Snap the case back together. The entire process takes about two minutes.
If your fob has a screw holding it together instead of a seam, you will need a small screwdriver, but the process is the same. Some newer fobs have a sliding battery door on the back instead of a case that opens—just slide it open, remove the battery, and slide the new one in. If you are uncomfortable opening the fob or if it appears glued shut, a dealership or independent car repair shop can do it for $25 to $75 in labor, though this is usually not necessary.
Why battery prices vary between retailers
The battery itself costs the manufacturer only a few cents, so the retail price reflects the store's markup and overhead rather than the product cost. Drugstores and supermarkets buy in large volume and compete on price, so they keep markups low. Dealerships buy in smaller quantities and factor in the cost of keeping a service department staffed, so their prices are higher.
Online bulk purchases are cheaper per battery because you are buying multiple units at once, spreading the shipping cost across more items. Specialty battery retailers sometimes charge more because they stock a wider range of types and serve customers who need batteries urgently or cannot find them elsewhere. None of these differences reflect the quality of the battery—a CR2032 from a drugstore works identically to a CR2032 from a dealership.
What to do if your fob battery dies before you expect it
Key fob batteries typically last three to four years depending on how often you use the fob. If the battery dies sooner, the fob may have a defect, or you may be using it more frequently than average. A dead battery is not an emergency—your car key still works mechanically, and you can unlock and start your vehicle by hand even if the remote buttons do not work.
If you are away from home when the battery dies, you can still drive the car. Use the physical key blade inside the fob to unlock the door, then insert the fob into the ignition slot and press the brake pedal while pushing the start button. The car will recognize the fob and start normally. Once you are home or near a store, buy a replacement battery and swap it in. If the battery dies again within a few months, the fob may have a loose connection or internal damage, and a dealership can inspect it for a diagnostic fee.
Frequently Asked Questions
Can I use a different battery type if I cannot find the exact one?
No. Battery types like CR2032, CR2025, and CR2016 have different thicknesses and voltages. Using the wrong type can damage the fob's circuit board or cause the buttons to malfunction. Always use the exact type printed on the old battery or listed in your owner manual.
Do I need to reprogram my key fob after changing the battery?
No. Replacing the battery does not erase the fob's programming. The fob will work when ready after you install the new battery. Reprogramming is only necessary if you lose the fob or buy a new one.
Is it cheaper to buy batteries in bulk online?
Yes, if you buy a pack of four or more batteries online, the per-battery cost is usually $2 to $3, which is lower than buying one battery at a drugstore. However, you will need to factor in shipping time. If you need a battery today, a local drugstore is faster and the $3 to $5 price is reasonable for a single battery.
What if my key fob case is glued shut and will not open?
Some luxury or newer vehicle fobs are sealed and cannot be opened without special tools. A dealership or independent car repair shop can open it for $25 to $75 in labor. Alternatively, you can try gently heating the seam with a hair dryer for 30 seconds to soften the adhesive, then carefully prying with a flathead screwdriver.
Will a dead key fob battery prevent my car from starting?
No. A dead fob battery only disables the remote lock and unlock buttons. You can still unlock the car with the physical key blade and start the engine by inserting the fob into the ignition slot and pressing the brake while pushing the start button.