Your key fob is one of those things you don’t think about—until it stops working at the worst possible time. The good news? A key fob battery is inexpensive and easy to replace, and doing it proactively can save you a ton of hassle.
How Often Should You Replace a Key Fob Battery?
Most key fob batteries last about 2–3 years with normal use. If you use remote start often, constantly lock/unlock from a distance, or store the fob near the vehicle, you may be closer to the 2-year mark.
A simple rule of thumb:
- Replace it every 2–3 years as preventative maintenance, even if it’s still working.
- Replace it immediately if you see a dash warning like “Key Fob Battery Low” or notice any performance changes.
Signs Your Key Fob Battery Is Dying
If your key fob is acting up, the battery is usually the first (and easiest) thing to check:
- You have to stand closer to your vehicle for it to work
- Buttons work intermittently
- Remote start becomes unreliable
- Your vehicle shows a “Key Fob Battery Low” alert
- You see “Key Not Detected” occasionally (especially in cold weather)
1) Avoid the “Won’t Start” Surprise
Many push-button start vehicles need to detect your fob to start the car. When the battery gets weak, your vehicle may not recognize the fob consistently—especially in winter. Replacing the battery early helps prevent those random “Key Not Detected” moments.
2) Prevent Being Locked Out (or Stuck Unlocking Manually)
A dying battery often shows up first as a shorter range—meaning you have to get closer and closer for the buttons to work. If it fails completely, you may be stuck using the manual key hidden inside the fob, or dealing with a car alarm that’s not thrilled about it.
3) Keep Remote Start and Keyless Entry Reliable
If you rely on remote start for cold mornings or use keyless entry daily, a weak battery can make features inconsistent. A fresh battery helps keep everything working the way it should.
4) It’s Cheap Insurance
Most key fobs use common coin-cell batteries (often CR2032 or similar). They’re affordable, widely available, and far cheaper than a tow, a missed appointment, or the stress of being stuck in a parking lot.
Quick Tip: Replace It Before Seasonal Extremes
Hot summers and freezing winters can shorten battery life. If you’re heading into a temperature swing—or taking a road trip—swapping the battery ahead of time is a smart move.
FAQ: What Battery Does My Key Fob Use?
Many vehicles use CR2032 or CR2025, but it varies by make/model and even by trim. Check your owner’s manual or bring the fob into your service department and they can confirm the correct battery and replace it for you too.
If your key fob range is getting shorter, you’re seeing “Key Fob Battery Low,” or it’s been 2–3 years since your last replacement, it’s a great time to swap it. Stop by our service department and we’ll help you identify the correct battery and get you back on the road with confidence.
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