The correct battery for a 2017 Honda Accord key fob is typically a CR2032 3V lithium coin cell battery. Replacing it is a simple DIY task that ensures your key fob works reliably for unlocking and starting your car.
Has your Honda Accord key fob suddenly stopped working? It can be a real hassle when you’re trying to get in your car or start the engine. Don’t worry, this is a common issue, and usually, it’s just a sign that the battery inside the key fob needs a simple replacement. You don’t need to be a car expert or a tech wizard to fix this. We’ll walk you through exactly what battery you need and how to swap it out, step by step. You’ll have your key fob working like new again in no time!
Understanding Your 2017 Honda Accord Key Fob Battery
Your Honda Accord key fob is a small but powerful device that lets you interact with your car wirelessly. It sends signals to unlock doors, lock them, and even start your engine with the push of a button or by being nearby. To do all this, it needs a consistent power source – a small, coin-shaped battery.
Over time, like any battery, the one in your key fob will eventually run out of juice. This is perfectly normal and doesn’t mean there’s anything wrong with your fob or your car. It’s just a sign that it’s time for a fresh battery to keep everything running smoothly. Knowing which battery to get and how to swap it out is a handy skill that can save you time and money.
Why Key Fob Batteries Die
Several things can contribute to your key fob battery losing power:
- Age: Batteries have a lifespan, and eventually, their chemical components degrade, reducing their ability to hold a charge.
- Usage: Frequent use of the buttons (locking, unlocking, panic alarm) will drain the battery faster.
- Environmental Factors: Extreme temperatures can sometimes affect battery performance and longevity.
- Accidental Button Presses: If the fob is in a pocket or purse, buttons can be accidentally pressed, draining the battery without you realizing it.
When your key fob starts acting up – maybe the range shortens, or it stops responding altogether – the most likely culprit is a low battery. Fortunately, replacing it is a straightforward process.
The Right Battery: What You Need for Your 2017 Honda Accord Key Fob
Finding the correct battery is the most crucial first step. Using the wrong type might not work, or worse, it could potentially damage the key fob. For your 2017 Honda Accord key fob, the standard battery is a CR2032 3-volt lithium coin cell battery.
These batteries are very common and can be found in many electronics, from car key fobs to small remote controls and even some personal fitness devices. They are known for their long shelf life and stable voltage output, making them ideal for remote keyless entry systems.
Identifying the CR2032 Battery
The CR2032 battery is a silver-colored, coin-shaped battery. “CR” indicates it’s a lithium battery, “20” refers to its diameter in millimeters (20mm), and “32” refers to its thickness in millimeters (3.2mm). The “3V” signifies its voltage.
You can usually find these batteries at:
- Grocery stores
- Drugstores
- Electronics stores
- Online retailers (Amazon, eBay, etc.)
- Hardware stores
When purchasing, it’s a good idea to buy a pack of two or more, as they are inexpensive. This way, you’ll have a spare on hand for the future, or you might have two fobs to replace the batteries in.
Why CR2032 is the Standard
The CR2032 battery is a popular choice for many automotive key fobs due to its:
- Compact Size: It fits perfectly within the small confines of a key fob.
- Adequate Power: The 3-volt power output is sufficient for the key fob’s transmitter.
- Reliability: Lithium coin cells offer good performance and longevity in various conditions.
Replacing this battery yourself requires no special tools, just a little patience, and the right battery.
Step-by-Step Guide: Replacing Your 2017 Honda Accord Key Fob Battery
Ready to get your key fob working again? Here’s a simple, step-by-step guide to safely replace the battery in your 2017 Honda Accord key fob. Remember to work on a clean, flat surface to avoid losing any small parts.
What You’ll Need:
- A new CR2032 3V lithium coin cell battery.
- A small flat-head screwdriver or a plastic prying tool (a guitar pick can also work well and is less likely to scratch).
- A clean, dry cloth (optional, for cleaning the inside of the fob).
Step 1: Locate the Seam or Notch on Your Key Fob
Most Honda Accord key fobs have a way to open them. Look closely at your key fob. You’ll usually find a small seam running around the edge where the two halves meet. Some fobs also have a small notch or slot, often near where the physical key inserts, specifically designed for prying open.
Step 2: Separate the Key Fob Halves
This is where you’ll need your prying tool or small screwdriver.
- Insert the tip of your flat-head screwdriver or prying tool into the seam or notch you identified.
- Gently twist the tool. This should start to pry the two halves of the key fob case apart.
- If it feels stuck, try moving the tool along the seam a bit. You might hear a slight click as clips release. Take your time and don’t force it, as you could crack the plastic.
- Once you’ve worked your way around the seam, the back cover should lift off, or the entire fob should split into two pieces.
Safety Tip: If your key fob has a separate physical key attached, you might need to slide a small tab or button to detach the metal key blade before you can open the fob. Consult your owner’s manual if you’re unsure how your specific model detaches.
Step 3: Locate and Remove the Old Battery
Once the key fob is open, you’ll see a small, circular battery inside. It will likely be held in place by a small metal clip or a snug fit.
- Carefully observe how the old battery is positioned. Note which side is facing up (usually the positive (+) side, often marked with a plus sign).
- Using your fingernail or the tip of your non-metallic prying tool, gently lift the old battery out. Be careful not to bend or damage the metal contacts that hold the battery.
Important Note: Dispose of the old battery properly. Many electronics stores and local recycling centers have battery recycling drop-off points.
Step 4: Install the New CR2032 Battery
This is the core of the replacement.
- Take your new CR2032 battery.
- Hold it with the correct side facing up, matching the orientation of the old battery (usually the side with the plus (+) symbol facing upwards).
- Carefully place the new battery into its spot in the key fob. It should sit snugly.
- Gently press down on the battery to ensure it’s properly seated and making good contact with the terminals. You shouldn’t have to force it.
Pro Tip: Some people like to clean the battery contacts inside the fob with a pencil eraser or a cotton swab lightly dampened with isopropyl alcohol (make sure it dries completely before reassembling) to ensure a good connection, though this is often not necessary if the contacts look clean.
Step 5: Reassemble the Key Fob
Now it’s time to put your key fob back together.
- Align the two halves of the key fob case.
- Gently press them together. You should hear them click into place, indicating the clips have re-engaged.
- If you detached a physical key, reattach the metal key blade to the fob.
Step 6: Test Your Key Fob
Before you put everything away, test your key fob to make sure the new battery is working.
- Try pressing the lock and unlock buttons.
- If you have a push-to-start ignition, try starting your car with the new fob.
If everything works, congratulations! You’ve successfully replaced your key fob battery. If it’s still not working, double-check that the battery is installed correctly (positive side up), that it’s the right type of battery, and that all the contacts are clean and making good contact. Sometimes the fob may need to be “re-synced” with the car, which is usually a simple process outlined in your owner’s manual or by trying a few button presses.
Troubleshooting Common Key Fob Battery Issues
Even with a new battery, you might encounter a few glitches. Here’s how to tackle them:
Key Fob Still Not Working After Battery Replacement
- Incorrect Battery Orientation: The most common mistake is installing the battery upside down. Ensure the positive (+) side is facing up.
- Dead New Battery: While rare, a new battery can sometimes be faulty. Try installing a different new CR2032.
- Dirty Contacts: The metal contacts inside the fob that touch the battery might be dirty or corroded. Gently clean them with a pencil eraser or a cotton swab dipped in rubbing alcohol (let it dry completely).
- Damaged Fob: The internal components of the fob might be damaged from a drop or moisture exposure.
- Resynchronization Needed: Sometimes, after a battery change or if the fob has been disconnected for a while, it needs to be re-synced with your car. This process varies by vehicle. For many Honda models, you can try holding down the lock and unlock buttons simultaneously for a few seconds while near the car, or consult your owner’s manual for the specific procedure.
Weak Signal or Short Range
If the fob works but only when you’re very close to the car, it could still indicate a weak battery, even if it’s new. Ensure the battery is firmly seated. If the problem persists, there might be interference from other electronic devices, or the fob itself might be failing.
Key Fob Case Damaged During Opening
If you accidentally cracked the plastic case while opening it, you might be able to use a small piece of strong tape (like electrical tape or duct tape) to secure the halves back together. For a more permanent fix, replacement key fob cases are available online, and you can transfer your internal electronics and new battery into the new shell.
For more detailed troubleshooting specific to your Honda Accord, the official Honda Technical Information System (requires subscription for full access, but basic owner’s manuals are often available for free download) is a valuable resource.
Key Fob Battery Lifespan and Maintenance
How long does a key fob battery last, and what can you do to make it last longer?
Typical Battery Lifespan
A CR2032 battery in a Honda Accord key fob typically lasts anywhere from 2 to 5 years. This is a broad range because it depends heavily on usage patterns and environmental conditions. If you use your key fob frequently, press buttons often, or live in an area with extreme temperatures, you might experience a shorter lifespan.
Tips for Extending Battery Life
- Minimize Unnecessary Button Presses: Try to use the buttons only when you need to lock, unlock, or use the panic feature.
- Avoid Accidental Presses: When carrying your fob in a pocket or purse, try to position it so that buttons are less likely to be pressed accidentally. A small key fob holder or a dedicated section in your bag can help.
- Keep it Cool: Avoid leaving your key fob in extremely hot (like a direct sunny dashboard) or cold environments for extended periods, as extreme temperatures can degrade battery performance over time.
- Use Your Spare Fob: If your car came with a spare key fob, use it periodically. This rotates the usage and helps ensure that both fobs remain in good working order, and their batteries are used evenly.
When to Consider a Spare Fob
If you only have one working key fob and its battery finally dies completely, you might be in a bind. While you can usually start a push-to-start Honda Accord by holding the fob right next to the start button in a battery-less state, you won’t be able to unlock or lock the doors remotely. Therefore, it’s always a good idea to either replace the battery proactively when you notice signs of weakness or to get a spare key fob programmed for your car before you absolutely need it.
Replacing a key fob battery is a far simpler and cheaper task than replacing a lost or completely dead fob. Staying on top of this small maintenance item can prevent unexpected inconveniences.
A Comparison of Key Fob Battery Types
While the CR2032 is the standard for your 2017 Honda Accord, it’s helpful to know that not all small batteries are the same. Different devices use different types, and understanding them can prevent confusion.
Here’s a quick look at common coin cell batteries and how they compare:
| Battery Type | Voltage | Common Uses | Key Differences |
|---|---|---|---|
| CR2016 | 3V | Smaller remotes, key fobs, calculators | Thinner (1.6mm) and smaller diameter than CR2032. Less capacity. |
| CR2025 | 3V | Car key fobs, remote controls, digital watches | Thinner (2.5mm) and slightly smaller diameter than CR2032. Less capacity. |
| CR2032 | 3V | Majority of Car Key Fobs, computer motherboards, medical devices, keyless entry systems | Standard size and capacity for many applications. |
| LR44 (or AG13) | 1.5V (Alkaline) | Toys, small electronic devices, laser pointers, basic calculators | Lower voltage (alkaline), not typically used in car fobs that require 3V. Shorter lifespan than lithium. |
As you can see, the voltage is often the same (3V), but the physical dimensions and capacity (how long they last) vary. Always check the markings on your old battery or your car’s manual to ensure you get the exact replacement your 2017 Honda Accord key fob requires.
It’s crucial to stick to the specified battery type for your fob. While a CR2025 might seem similar, its slightly different dimensions and capacity might not work reliably or could even cause issues within the fob’s circuitry.
Battery Disposal and Environmental Considerations
When you replace your key fob battery, you’ll have an old one to deal with. It’s important to handle battery disposal responsibly to protect the environment.
Why Proper Disposal Matters
- Environmental Protection: Batteries, especially older types, can contain heavy metals and chemicals that can be harmful if they leak into the soil and water supply.
- Resource Conservation: Recycling batteries allows valuable materials to be recovered and reused, reducing the need for new raw material extraction.
- Safety: In some cases, damaged batteries can pose a fire risk. Improper disposal in household waste could lead to issues in waste processing facilities.
How to Dispose of Your Old Battery
Never throw coin cell batteries in your regular trash bin. Instead, follow these guidelines:
- Battery Recycling Centers: Many electronics stores (like Best Buy, Staples), home improvement stores (like Home Depot, Lowe’s), and community recycling centers offer free battery drop-off points.
- Local Waste Management Facilities: Check your city or county’s waste management website for specific instructions on household hazardous waste disposal, which often includes batteries.
- Mail-in Programs: Some battery manufacturers or environmental organizations offer mail-in recycling programs for batteries.
The CR2032 is a lithium battery, and while generally safer than older types, responsible recycling is still the best practice. For more information on battery recycling in the US, you can check resources from the
