How to Change a Key Fob Battery
- by Joe Weber - updated on 9/19/2025
Your key fob is one of those everyday items you don't think about—until it stops working. Whether your car won't unlock from a distance, or you're greeted with a low battery warning on your dashboard, changing the battery in your key fob is a quick and simple fix. In most cases, it's something you can do yourself in minutes.
Here's everything you need to know about replacing your key fob battery.
Key Takeaways
- Most key fob batteries last 3–4 years before needing replacement.
- Common battery types include CR2025 and CR2032 coin cells.
- Signs of a weak battery include reduced range, inconsistent locking/unlocking, or a warning message on your dashboard.
- Batteries Plus carries a wide selection of replacement key fob batteries and offers professional key fob replacement and programming services at many locations.
How Do I Know If My Key Fob Battery Is Dying?
Your car remote or keyless entry fob will often give you clear signs when the key fob battery is running low. If you notice any of these issues, it's time to consider a key fob battery replacement:
- Reduced signal range – You have to stand closer to your vehicle for the remote to work.
- Repeated button presses – Locking or unlocking takes multiple tries.
- Inconsistent performance – The fob sometimes works, sometimes doesn't.
- Dashboard warning light or message – Some vehicles display a "key fob battery low" alert.
If you're experiencing any of these symptoms, replacing the car key battery is usually a quick and inexpensive fix.
What Battery Does My Key Fob Use?
Most key fobs are powered by small coin cell batteries, with CR2025 and CR2032 being the most common. The easiest way to confirm is to check your vehicle's owner's manual or open the fob to look at the current battery.
If you're unsure, Batteries Plus associates can help identify and install the correct replacement battery for your fob.
How to Replace a Key Fob Battery
In most cases, replacing a key fob battery is a quick and easy process you can do yourself with just a few simple tools. While designs vary from one car to the next, the steps are generally the same:
- Open the key fob – Look for a small notch or seam. A flat tool (like a small screwdriver or even a coin) can help pry it open.
- Remove the old battery – Take note of the battery's orientation before removing it.
- Insert the new battery – Place the new coin cell in the same orientation.
- Snap the fob back together – Ensure it clicks securely in place.
That's it—you're good to go.
Professional Key Fob Services at Batteries Plus
Not comfortable replacing it yourself? Many Batteries Plus locations offer key fob battery replacement, key cutting, and key fob programming services—all designed to save you time and money.
Batteries
- One-time or unlimited replacement options – Choose a single replacement, or go unlimited and never pay for a key fob battery again.
- Hassle-free convenience – Fast, professional service with no appointment required.
- Immediate results – Get your key fob working again in minutes.
Key Fob Replacement & Programming
- Save over 50% compared to the dealership
- OEM-grade parts for reliable performance
- Expert programming without the wait and expense of a dealership visit
Whether you need a quick battery swap or a completely new fob, Batteries Plus is your one-stop shop for key fob solutions.
FAQ: Key Fob Battery Replacement
Q: How long does a key fob battery last?
A: On average, 3–4 years. Heavy use or extreme temperatures can shorten that lifespan.
Q: Do I need to reprogram my key fob after changing the battery?
A: In most cases, no. Simply replacing the battery won't erase the fob's memory. If your fob still isn't working, Batteries Plus can help with reprogramming services at many locations.
Q: Can I use any coin cell battery in my key fob?
A: No. Always use the exact battery type recommended for your key fob (CR2025, CR2032, etc.) for proper fit and performance.
Q: What if replacing the battery doesn't fix my key fob?
A: If the issue continues, the fob itself may be damaged. Batteries Plus can provide replacement fobs and programming services for most makes and models.
Keep Your Car Ready with Key Fob Battery Replacement
A dead key fob battery can leave you stranded at the worst possible time. Swapping in a new one is quick and easy, but if you'd rather skip the hassle, Batteries Plus is here to help.
With both single replacement and unlimited replacement plans available, plus professional key fob cutting and programming services, we make sure your keys work when you need them most.
Visit your local Batteries Plus store today to get your key fob battery replaced and keep your car ready to go.