Replace the battery yourself in under five minutes
Most Toyota key fobs use a coin-cell battery that you can swap out at home without tools or a trip to the dealer. The battery usually lasts three to four years, and when it dies, the fob stops locking and unlocking your car—though your physical key still works. You can buy a replacement battery at any drugstore or supermarket for two to five dollars, and the whole job takes less time than it takes to find your keys in the first place.
The exact battery type depends on your Toyota model and year, but the process is nearly identical across all recent Toyotas. You'll need to identify which battery your fob uses, buy the right one, and pop the old one out. If you get stuck, a Toyota dealer can do it for you, but you almost certainly won't need to.
Key Takeaways
- Most Toyota key fobs use a CR2032 or CR2016 coin-cell battery that costs two to five dollars and lasts three to four years.
- You can identify the correct battery by opening the fob and reading the number stamped on the old battery, or by checking your owner's manual.
- The battery slides or pops out of a small compartment; no screwdriver or special tool is needed for most models.
- If your fob has a physical key attached, you may need to slide or pry it out first to access the battery compartment.
- A Toyota dealer can replace the battery for you if you prefer, though the cost is usually higher than doing it yourself.
Find out which battery your Toyota fob needs
The battery type is printed on the old battery itself. Open your fob by sliding the physical key out or prying gently at the seam with a coin or flat object, then look at the battery already inside. You'll see a number like CR2032 or CR2016 stamped on it—that's the battery you need to buy.
If you can't open the fob or the number isn't visible, check your owner's manual. Search the index for "key fob battery" or "remote battery," and it will list the part number. You can also call a Toyota dealer with your vehicle's year, make, and model, and they'll tell you the battery type over the phone.
CR2032 is by far the most common battery in Toyota fobs made in the last ten years. If you're not sure, buying a CR2032 is a safe bet—you can return it if it doesn't fit.
Open the fob and remove the old battery
Look for a seam running around the edge of your fob. On most models, you can slide the physical key out by pressing a small button on the back, or you can pry the key out gently with your fingernail. Once the key is out, you'll see a slot or groove where you can fit a coin or a flat object.
Insert a coin—a dime or penny works—into the slot and twist gently. The fob will pop open into two halves. Don't force it; if it's not moving, you may be twisting in the wrong direction or the seam may be on a different edge.
Inside, you'll see the battery sitting in a small metal holder. Note which side is facing up—the + or - symbol should be visible. Slide or pop the battery out. If it's stuck, a gentle pry with a coin edge will free it. Don't touch the battery's surface with your bare fingers; skin oils can reduce its lifespan.
Insert the new battery and close the fob
Slide the new battery into the holder with the same side facing up as the old one was. The + side should face the same direction. Press it down gently until it clicks or sits flush in the holder.
Close the fob by pressing the two halves together until you hear or feel a click. Slide the physical key back in if you removed it. Test the fob by pressing the lock and unlock buttons—your car should respond right away. If it doesn't, open the fob again and check that the battery is seated properly and facing the right direction.
What to do if the fob still doesn't work
If the new battery doesn't bring the fob back to life, the problem may not be the battery. Check that you installed the battery the right way—the + side should face up or toward the circuit board, depending on your model. Open the fob again and look at how the old battery was positioned, then match that exactly.
If the battery is in correctly and the fob still won't work, the circuit board or buttons inside may be damaged. Water damage is a common culprit—if your fob has been dropped in water or exposed to moisture, the electronics may have corroded. In that case, you'll need a replacement fob, which a Toyota dealer can order for you.
If you're not confident opening the fob yourself, or if you've tried and the fob still doesn't work, a Toyota dealer can replace the battery for you. The service usually costs between fifteen and thirty dollars, plus the cost of the battery.
Where to buy a replacement battery
Coin-cell batteries are sold at nearly every pharmacy, supermarket, and drugstore. Look in the electronics or watch battery section. Walmart, Target, CVS, Walgreens, and most grocery stores carry CR2032 and CR2016 batteries. You can also order them online from Amazon or eBay for the same price or less.
Buy a name-brand battery if you can—Duracell, Energizer, and Panasonic are reliable. Generic batteries work fine too, but they may not last quite as long. A single battery costs between two and five dollars depending on the brand and where you buy it.
Frequently Asked Questions
Can I use a different battery type if I can't find the exact one?
No—use only the battery type stamped on your old battery or listed in your manual. Using the wrong size or voltage can damage the fob's circuit board or cause the buttons to malfunction. If you can't find the exact battery locally, order it online rather than substituting.
How long does a Toyota key fob battery last?
Most coin-cell batteries last three to four years with normal use. If you use your fob frequently—pressing the buttons many times a day—the battery may wear out sooner. Some batteries last five years or longer if used lightly.
What if I drop the battery or touch it with my fingers?
If you drop it on a clean floor, it's fine to use. If you touched it with your bare fingers, wipe it dry with a clean cloth before installing it. Skin oils can slightly reduce battery life, but it won't cause when ready failure.
Do I need to reprogram my fob after replacing the battery?
No. Replacing the battery does not erase any programming. Your fob will work exactly as it did before, as long as the new battery is installed correctly and the fob wasn't damaged before the battery died.
What should I do with the old battery?
Most coin-cell batteries can go in your regular trash, but some communities have battery recycling programs. Check your local waste management website to see if batteries should be recycled in your area. Many retailers that sell batteries also accept old ones for recycling.