Subaru Key Fob Battery Type: Complete Guide for All Models

Few things are more frustrating than approaching your Subaru, pressing the key fob button, and getting no response. Whether you are trying to unlock the doors, open the trunk, or start your vehicle with a push-button ignition system, a dead or weak key fob battery can quickly turn a simple task into an unexpected inconvenience.

Many Subaru owners assume that all key fobs use the same battery type. However, that is not always the case. Depending on the model, trim level, and production year, Subaru key fobs may use different coin-cell batteries such as CR2032, CR2025, or CR1620. Choosing the wrong battery can result in poor performance, intermittent functionality, or a key fob that does not work at all after replacement.

Another common challenge is identifying the correct battery without opening the key fob or consulting the owner’s manual. This often leads to unnecessary trips to the dealership, purchasing incompatible batteries, or spending money on professional replacement services for a task that most vehicle owners can easily complete themselves.

In this comprehensive guide, you will learn everything you need to know about Subaru key fob battery types across all major Subaru models. We will cover battery compatibility by model and year, explain how to identify the correct battery, provide step-by-step replacement instructions, discuss common troubleshooting issues, and share expert tips to help extend battery life. By the end of this guide, you will have the confidence to choose the right battery and keep your Subaru key fob functioning reliably.

Understanding Subaru Key Fob Battery Types

Subaru key fobs rely on compact lithium coin-cell batteries to power their wireless communication systems. These batteries provide the energy required for remote locking and unlocking, panic alarm activation, trunk release functions, and push-button start systems found in many modern Subaru vehicles. Although they are small, these batteries play a critical role in the everyday convenience and security of your vehicle.

The most commonly used Subaru key fob battery types are CR2032, CR2025, and CR1620. Each battery designation refers to specific dimensions. For example, a CR2032 battery has a diameter of 20 millimeters and a thickness of 3.2 millimeters. A CR2025 battery shares the same diameter but is thinner at 2.5 millimeters. The CR1620 battery is both smaller in diameter and thinner, making it suitable for certain older key fob designs.

One of the most common mistakes Subaru owners make is assuming that batteries with similar names are interchangeable. While some batteries may physically fit into the compartment, using the wrong thickness can affect contact pressure and electrical performance. This may lead to weak signal transmission, inconsistent operation, or complete failure of the key fob.

Most modern Subaru smart key systems use CR2032 batteries because they offer higher capacity and longer service life. However, some older Subaru vehicles may use CR2025 or CR1620 batteries depending on the specific key fob design.

To identify the correct battery for your key fob, check the battery currently installed inside the remote or consult your owner’s manual. The battery code is typically printed directly on the battery surface, making identification quick and straightforward.

Understanding the differences between these battery types can save time, prevent unnecessary purchases, and ensure your Subaru key fob continues to operate reliably.

Subaru Key Fob Battery Type Chart by Model

One of the most frequently asked questions among Subaru owners is which battery their specific key fob requires. While the CR2032 battery is the most common option used in modern Subaru vehicles, battery requirements can vary depending on the model year and key fob design.

The following guide provides a general overview of battery types commonly found in popular Subaru models.

Subaru Outback

Most Subaru Outback models equipped with smart key systems use a CR2032 battery. Newer generations featuring keyless entry and push-button start almost exclusively rely on this battery type due to its higher capacity and dependable performance.

Subaru Forester

The Subaru Forester typically uses a CR2032 battery for smart key fobs. Owners of older Forester models should verify battery specifications before purchasing replacements, as some earlier key designs may differ.

Subaru Crosstrek

The Crosstrek is one of Subaru’s most popular compact crossovers. Most key fobs for recent model years use CR2032 batteries, providing reliable operation for keyless entry and remote start features.

Subaru Impreza

Many Subaru Impreza models utilize CR2032 batteries. However, owners of older generations should inspect their existing battery before replacement to ensure compatibility.

Subaru Legacy

The Subaru Legacy generally follows the same battery requirements as the Outback due to shared platforms and technologies. CR2032 batteries are commonly used in modern models.

Subaru WRX

Performance-oriented WRX models equipped with advanced smart key systems typically use CR2032 batteries. Their higher energy capacity supports frequent daily use and long battery life.

Subaru Ascent

As Subaru’s flagship family SUV, the Ascent uses sophisticated keyless entry technology. Most Ascent key fobs require a CR2032 battery.

Subaru BRZ

The Subaru BRZ sports coupe commonly uses CR2032 batteries in its smart key systems, offering dependable performance for daily driving and enthusiast use alike.

Older Subaru Models

Certain older Subaru vehicles may use CR1620 or CR2025 batteries. Since battery specifications can vary significantly by production year, owners should always verify the battery code before purchasing a replacement.

Quick Reference Table

Subaru Model	Common Battery Type
Outback	CR2032
Forester	CR2032
Crosstrek	CR2032
Impreza	CR2032
Legacy	CR2032
WRX	CR2032
Ascent	CR2032
BRZ	CR2032
Older Models	CR1620 or CR2025

Although this chart covers the most common configurations, checking your owner’s manual or inspecting the existing battery remains the most reliable way to confirm compatibility.

How to Identify the Battery in Your Subaru Key Fob

Before purchasing a replacement battery, it is important to confirm exactly which battery type your Subaru key fob uses. This simple step can prevent compatibility issues and ensure a successful replacement.

Begin by locating the mechanical emergency key hidden inside the key fob. Most Subaru smart keys include a small release button that allows you to remove this backup key. Once removed, you can access the seam that separates the two halves of the key fob housing.

Using a plastic trim tool or a small flat-head screwdriver, carefully open the key fob. Take your time during this process, as excessive force can damage the clips that secure the housing. A damaged casing may compromise water resistance and reduce the durability of the key fob over time.

After opening the remote, locate the battery compartment. The battery code is typically printed on the visible side of the battery. Common markings include CR2032, CR2025, or CR1620. Make note of both the battery type and the orientation of the positive and negative terminals before removal.

In addition to checking the battery itself, many Subaru owner’s manuals contain battery specifications and replacement instructions. Consulting the manual can provide additional confirmation, especially if the battery markings have become difficult to read.

When purchasing a replacement, choose batteries from reputable manufacturers such as Panasonic, Energizer, Duracell, or Murata. High-quality batteries generally provide more consistent voltage output, longer lifespan, and improved reliability compared to low-cost alternatives.

Taking a few extra minutes to verify the correct battery type can save significant time and frustration later. A properly matched battery ensures optimal key fob performance and helps avoid unnecessary troubleshooting after installation.

How to Replace a Subaru Key Fob Battery

Replacing a Subaru key fob battery is a simple maintenance task that most owners can complete in just a few minutes. No special programming is usually required, and the process can help restore full functionality to your remote without the expense of visiting a dealership.

Start by removing the emergency key from the key fob. Most Subaru smart keys include a release button that allows the hidden key to slide out easily. Once removed, locate the seam running around the edge of the key fob housing.

Carefully insert a small flat-head screwdriver or plastic pry tool into the seam and gently twist to separate the two halves of the casing. Work slowly to avoid damaging the plastic clips that hold the housing together. Excessive force can crack the casing or affect the key fob’s ability to close securely after reassembly.

After opening the key fob, remove the old battery. Pay close attention to the battery’s orientation before taking it out. The positive side is usually marked with a plus sign and often faces upward, although this may vary depending on the key fob design.

Insert the new battery into the compartment, ensuring it matches the original battery type and is positioned correctly. Using an incorrect battery or installing it backward may prevent the key fob from functioning properly.

Once the new battery is in place, align the two halves of the casing and press them together until all clips snap securely into position. Reinsert the emergency key and test the lock, unlock, trunk release, and panic buttons to verify proper operation.

Many Subaru owners are surprised by how quick and easy this process can be. With the correct battery and a few minutes of careful work, your key fob can be restored to full performance without professional assistance.

Signs Your Subaru Key Fob Battery Is Dying

A key fob battery rarely fails without warning. In most cases, your Subaru will provide several signs that indicate the battery is approaching the end of its service life. Recognizing these symptoms early can help prevent unexpected inconvenience and ensure uninterrupted access to your vehicle.

One of the first signs is a reduced operating range. You may notice that you need to stand closer to the vehicle before the lock or unlock buttons respond. If the key fob previously worked from across a parking lot but now only functions a few feet away, the battery may be losing power.

Another common symptom is inconsistent performance. The remote may work perfectly one moment and fail the next. You might find yourself pressing buttons multiple times before the vehicle responds. This behavior often indicates that the battery can no longer provide a stable power supply.

Owners of newer Subaru models equipped with keyless entry and push-button start systems may receive dashboard warnings related to the access key battery. These notifications are designed to alert drivers before complete battery failure occurs.

Difficulty starting the vehicle with a push-button ignition system can also indicate a weak key fob battery. While many Subaru models include backup procedures that allow the vehicle to start even with a depleted battery, relying on emergency methods can be inconvenient and stressful.

Environmental factors can accelerate battery wear as well. Extremely hot or cold temperatures, frequent use of remote functions, and prolonged storage of the key fob near electronic devices may all contribute to shorter battery life.

By paying attention to these warning signs and replacing the battery before it fails completely, Subaru owners can avoid lockout situations and maintain reliable operation of their vehicle’s keyless entry system.

Common Subaru Key Fob Battery Replacement Problems and Solutions

Although replacing a Subaru key fob battery is usually straightforward, some owners encounter problems immediately after installing a new battery. Understanding the most common issues can help you troubleshoot effectively and avoid unnecessary dealership visits.

One of the most frequent complaints is that the key fob still does not work after battery replacement. In many cases, the cause is an incorrectly installed battery. Even a brand-new battery will not function if the positive and negative sides are reversed. Double-checking battery orientation should always be the first troubleshooting step.

Another common issue involves installing the wrong battery type. Batteries such as CR2032 and CR2025 may appear similar, but differences in thickness can affect contact pressure inside the compartment. Poor contact can result in weak signals or complete failure.

Dirty or corroded battery terminals can also interfere with performance. Over time, dust, moisture, and oxidation may accumulate on the contacts. Cleaning the terminals carefully with a soft cloth can often restore proper electrical connectivity.

Some owners experience reduced range or inconsistent operation even after installing a new battery. This problem is frequently linked to low-quality or counterfeit batteries. Purchasing replacement batteries from trusted manufacturers helps ensure reliable voltage output and longer service life.

Physical damage inside the key fob may also be responsible. Dropping the remote, exposing it to water, or forcing the casing open can damage internal components. If the key fob remains unresponsive despite installing the correct battery, internal circuitry may require professional inspection.

In rare situations, electronic synchronization issues can occur after battery replacement. Although most Subaru key fobs do not require reprogramming when the battery is changed, consulting the owner’s manual or a Subaru dealership may be necessary if communication problems persist.

Approaching troubleshooting methodically can often resolve key fob issues quickly. Most problems stem from battery orientation, compatibility, or contact-related concerns rather than serious electronic failures.

How Long Does a Subaru Key Fob Battery Last?

One of the most common questions Subaru owners ask is how often they should replace their key fob battery. While there is no exact replacement schedule that applies to every vehicle, most Subaru key fob batteries last between two and five years under normal operating conditions.

Battery lifespan depends on several factors, including the type of key fob, frequency of use, environmental conditions, and battery quality. Drivers who frequently use remote lock, unlock, trunk release, and remote start functions may notice shorter battery life compared to those who use these features less often.

Modern Subaru vehicles equipped with keyless entry and push-button start systems may consume battery power more quickly than older remote key systems. This is because smart keys continuously communicate with the vehicle when they are nearby, even when buttons are not actively being pressed.

Climate can also affect battery performance. Extremely cold temperatures can temporarily reduce battery output, while prolonged exposure to excessive heat may accelerate battery degradation. Owners living in regions with harsh seasonal weather may experience shorter battery life than those in moderate climates.

The quality of the replacement battery is another important factor. Premium lithium coin-cell batteries from reputable manufacturers generally provide more stable voltage and longer service life than inexpensive generic alternatives. Although premium batteries may cost slightly more upfront, they often offer better long-term value through improved reliability.

To maximize battery life, avoid storing your key fob near devices that generate electromagnetic signals, such as smartphones, tablets, wireless chargers, or Wi-Fi routers. Keeping the key fob clean and protecting it from moisture can also help maintain optimal performance.

As a general rule, replacing the battery at the first sign of reduced range or inconsistent operation is the best way to avoid unexpected failures and maintain uninterrupted access to your Subaru.

Best Replacement Batteries for Subaru Key Fobs

Choosing the right replacement battery is just as important as selecting the correct battery size. While many coin-cell batteries may appear identical, quality differences can significantly impact performance, reliability, and lifespan.

Panasonic CR2032

Panasonic is widely recognized as one of the most trusted manufacturers of lithium coin-cell batteries. Many automotive manufacturers use Panasonic batteries as original equipment because of their consistent voltage output and long service life. Subaru owners looking for dependable performance often consider Panasonic a top choice.

Energizer CR2032

Energizer batteries are known for their widespread availability and strong reputation for reliability. They perform well in Subaru key fobs and can be found at most automotive stores, supermarkets, and online retailers. Their combination of quality and convenience makes them a popular option among vehicle owners.

Duracell CR2032

Duracell has built a reputation for producing durable and long-lasting batteries. Their CR2032 batteries provide stable power delivery and are designed to perform well under varying environmental conditions. Many Subaru owners choose Duracell for its trusted brand recognition and consistent performance.

Murata CR2032

Previously associated with Sony battery technology, Murata batteries are highly regarded for their quality and longevity. These batteries are often recommended by electronics professionals due to their reliability and precise manufacturing standards.

What to Avoid

While low-cost generic batteries may seem attractive, they often provide inconsistent voltage and shorter service life. Some counterfeit batteries even carry fake branding and fail prematurely. Purchasing batteries from reputable retailers and trusted brands helps ensure that your Subaru key fob operates as intended.

Investing in a high-quality battery can reduce replacement frequency, improve key fob responsiveness, and minimize the risk of unexpected battery failure when you need your vehicle most.

Frequently Asked Questions

What battery does a Subaru key fob use?

Most modern Subaru key fobs use a CR2032 lithium coin-cell battery. However, some older models may use CR2025 or CR1620 batteries. Always verify the battery type installed in your specific key fob before purchasing a replacement.

Is CR2032 the most common Subaru key fob battery?

Yes. The CR2032 battery is the most commonly used battery in modern Subaru smart key systems, including many Outback, Forester, Crosstrek, Legacy, WRX, BRZ, and Ascent models.

Can I replace a Subaru key fob battery myself?

Absolutely. Replacing a Subaru key fob battery is a simple process that typically takes only a few minutes and requires minimal tools. Most owners can complete the replacement without professional assistance.

Why does my key fob not work after changing the battery?

Common causes include installing the battery incorrectly, using the wrong battery type, dirty battery contacts, damaged internal components, or a defective replacement battery.

How much does Subaru charge for key fob battery replacement?

Costs vary by dealership and location, but many dealerships charge between $10 and $30 for battery replacement. Performing the replacement yourself is usually much less expensive.

Can a low key fob battery prevent my Subaru from starting?

In some push-button start vehicles, a weak battery can make starting more difficult. However, most Subaru models include an emergency starting procedure that allows the vehicle to recognize the key fob even when the battery is nearly depleted.

How often should I replace my Subaru key fob battery?

Most Subaru key fob batteries last between two and five years. Replacement should be considered whenever you notice reduced operating range, inconsistent performance, or battery warning messages.

What happens if I use the wrong battery in my key fob?

Using the wrong battery may cause poor electrical contact, reduced performance, intermittent operation, or complete failure of the key fob. Always use the battery type specified for your vehicle.

Conclusion

Understanding the correct Subaru key fob battery type is essential for maintaining reliable access to your vehicle and ensuring that all remote functions continue to operate smoothly. While the CR2032 battery is the most commonly used option in modern Subaru models, some older key fobs may require a CR2025 or CR1620 battery. Taking the time to verify your specific battery type before making a purchase can help you avoid compatibility issues and unnecessary frustration.

Fortunately, replacing a Subaru key fob battery is a simple task that most owners can complete in just a few minutes. By following the proper replacement steps and choosing a high-quality battery from a trusted manufacturer, you can extend the life of your key fob and reduce the likelihood of unexpected failures.

Regularly monitoring your key fob’s performance is also important. Reduced operating range, delayed responses, and battery warning messages are all signs that it may be time for a replacement. Addressing these issues early can prevent inconvenient situations and keep your Subaru’s keyless entry and push-button start features functioning as intended.

Whether you drive an Outback, Forester, Crosstrek, Legacy, WRX, Ascent, or another Subaru model, selecting the right Subaru key fob battery and maintaining it properly will help ensure dependable performance for years to come.