2020 Nissan Altima Key Fob Battery Size

The 2020 Nissan Altima, a staple in the mid-size sedan market, continues to offer a blend of comfort, fuel efficiency, and technology. A seemingly minor but essential component of this modern vehicle is its key fob. This article delves into the specific battery required for the 2020 Altima key fob, providing a comprehensive guide for owners and automotive professionals alike.

Understanding the 2020 Nissan Altima Key Fob

The 2020 Altima's key fob allows for keyless entry, remote start (on equipped models), and operation of the trunk release. Its functionality relies on a small, readily available coin cell battery. Knowing the correct battery type ensures proper operation and avoids potential damage to the fob itself.

Key Fob Functions: More Than Just Unlocking Doors

Beyond the basic locking and unlocking functions, the 2020 Altima key fob can perform the following:

Keyless Entry: Allows the doors to unlock automatically when the fob is within a certain proximity to the vehicle.
Remote Start: Enables the engine to be started remotely, allowing the cabin to warm up or cool down before entering (available on certain trim levels).
Panic Alarm: Activates the horn and hazard lights in emergency situations.
Trunk Release: Opens the trunk remotely.

The Correct Battery: CR2032 Lithium Coin Cell

The 2020 Nissan Altima key fob uses a CR2032 type battery. This is a common 3-volt lithium coin cell battery, widely available at drug stores, supermarkets, auto parts stores, and online retailers. Its dimensions are 20mm in diameter and 3.2mm in thickness, hence the designation '2032'.

Why CR2032?

The CR2032 battery is chosen for its:

Compact Size: Its small size allows it to fit neatly inside the key fob.
Voltage: The 3-volt output is sufficient to power the fob's internal circuitry.
Longevity: Lithium batteries have a long shelf life and provide consistent power over an extended period.
Availability: Its widespread use makes it easy to find and purchase.

Replacing the Key Fob Battery: A Step-by-Step Guide

Replacing the battery in your 2020 Altima key fob is a straightforward process that most owners can perform themselves. Here's a detailed guide:

Gather Your Tools: You'll need a small flathead screwdriver or a similar prying tool, and a new CR2032 battery.
Locate the Notch: Examine the key fob for a small notch or slot, typically located on the side or bottom edge.
Open the Fob: Insert the flathead screwdriver into the notch and gently twist to separate the two halves of the key fob. Be careful not to apply excessive force, as this could damage the plastic casing. Some models might require sliding a release button before prying open.
Remove the Old Battery: Once the fob is open, you'll see the old CR2032 battery. Note the orientation of the battery (usually positive side up). Use the screwdriver or your fingernail to gently pry the battery out of its holder.
Insert the New Battery: Insert the new CR2032 battery into the holder, ensuring that the positive (+) side is facing up.
Reassemble the Fob: Carefully align the two halves of the key fob and press them together until they snap securely into place.
Test the Fob: Test the key fob's functionality by pressing the buttons to lock, unlock, and start the vehicle (if equipped).

Troubleshooting Battery Replacement

If the key fob doesn't work after replacing the battery, consider the following:

Battery Orientation: Double-check that the battery is installed with the correct polarity (+ side up).
Battery Contact: Ensure that the battery terminals are clean and making good contact with the battery. You can gently clean them with a cotton swab and rubbing alcohol.
Battery Quality: Use a fresh, high-quality CR2032 battery from a reputable brand. Cheap or old batteries may not provide enough power.
Fob Damage: Inspect the fob's internal components for any signs of damage. If the fob is damaged, it may need to be replaced.

Key Fob Battery Life and Maintenance

The lifespan of a CR2032 battery in a key fob typically ranges from 1 to 3 years, depending on usage and environmental factors. Frequent use of the remote start function or storing the fob near sources of radio frequency interference can shorten battery life.

Signs of a Weak Key Fob Battery

Here are some common signs that your 2020 Altima key fob battery is running low:

Reduced Range: You need to be closer to the vehicle for the key fob to work.
Intermittent Operation: The key fob works sometimes, but not others.
Dashboard Warning Light: Some Altimas may display a warning message on the dashboard indicating a low key fob battery.

Extending Battery Life

While battery replacement is inevitable, you can take steps to extend the lifespan of your key fob battery:

Store the Fob Away from Interference: Keep the fob away from electronic devices that emit radio frequency signals, such as cell phones, laptops, and other key fobs.
Limit Remote Start Usage: Frequent use of the remote start feature can drain the battery more quickly.
Replace the Battery Promptly: Don't wait until the battery is completely dead before replacing it. Replacing it when you first notice signs of weakness can prevent potential inconvenience.

The Cost of Replacement

The cost of a CR2032 battery is generally inexpensive, ranging from $2 to $5 depending on the brand and retailer. Replacing the battery yourself is the most cost-effective option. However, if you prefer, a dealership or automotive repair shop can replace the battery for you, but the cost will likely be higher due to labor charges.

DIY vs. Professional Replacement

DIY Replacement:

Pros: Saves money, convenient, quick.
Cons: Requires basic tools, risk of damaging the fob if not careful.

Professional Replacement:

Pros: Ensures proper installation, minimizes risk of damage.
Cons: More expensive, requires a trip to a dealership or repair shop.

Beyond the Battery: Key Fob Programming

In most cases, replacing the key fob battery will not require reprogramming the fob. The fob should continue to function normally after the new battery is installed. However, if the fob has been damaged or if the vehicle's security system has been reset, reprogramming may be necessary. This usually requires specialized equipment and is best left to a qualified technician at a dealership or automotive locksmith.

Important Note: Always refer to your 2020 Nissan Altima owner's manual for specific instructions and safety precautions related to key fob battery replacement.

Alternative Key Fob Options and Considerations

While replacing the battery is the most common solution for a malfunctioning key fob, there are other scenarios to consider. If the key fob is lost or damaged beyond repair, a replacement fob will be required. This typically involves purchasing a new fob from a dealership or a reputable online retailer, and then having it programmed to the vehicle.

Aftermarket Key Fobs

While aftermarket key fobs are available, it's generally recommended to stick with OEM (Original Equipment Manufacturer) fobs from Nissan. Aftermarket fobs may not be fully compatible with the vehicle's security system or may have limited functionality.

Key Fob Insurance

Some auto insurance policies offer coverage for lost or damaged key fobs. Check your policy to see if you have this coverage.

Conclusion

Knowing the correct battery size for your 2020 Nissan Altima key fob, the CR2032, and understanding the replacement process are essential for maintaining the convenience and security of your vehicle. By following the steps outlined in this guide and taking proper care of your key fob, you can ensure its reliable operation for years to come. This knowledge is valuable not only for Altima owners but also for automotive professionals who service these vehicles.