What Size Battery Does a Fossil Watch Require?

AvatarByArmando Lewellen Watch Brands

When it comes to keeping your Fossil watch ticking flawlessly, one of the most essential components is the battery. Knowing the right size battery for your Fossil watch not only ensures optimal performance but also extends the life of this stylish timepiece. Whether you’re a watch enthusiast or simply looking to replace a dead battery, understanding the basics of watch batteries can save you time, money, and unnecessary hassle.

Fossil watches, known for their blend of classic design and modern technology, often require specific battery types tailored to their unique mechanisms. Choosing the incorrect battery size can lead to improper fit, reduced accuracy, or even damage to the watch’s internal components. As you explore the topic, you’ll discover how battery sizes vary across different Fossil models and why it’s crucial to match the right battery to your watch.

In the following sections, we’ll delve into the factors that determine the appropriate battery size for Fossil watches, tips for identifying the correct replacement, and how to maintain your watch’s power for long-lasting reliability. Whether you’re preparing for a DIY battery change or simply want to understand more about your timepiece, this guide will equip you with the knowledge you need.

Common Battery Sizes for Fossil Watches

Fossil watches typically use small button cell batteries, which are essential for powering the quartz movement inside the watch. The exact battery size can vary depending on the model and its functions, such as chronographs or smart features. However, most traditional Fossil watches employ standard silver oxide button cells.

The most common battery sizes found in Fossil watches include:

  • SR621SW (364/363): This is one of the most frequently used batteries in Fossil analog watches. It offers a voltage of 1.55V and has a diameter of 6.8mm and a height of 2.1mm.
  • SR920SW (370/371): Slightly larger and often used in watches with additional complications like chronographs.
  • SR927SW (395/399): Used in models requiring a longer battery life or higher power consumption.
  • CR2032: Occasionally found in Fossil smartwatches or hybrid models, this lithium battery differs from silver oxide and provides a higher voltage (3V).

To ensure the correct battery replacement, it is crucial to verify the existing battery code by opening the watch case or consulting the user manual.

Battery Code Common Alternate Codes Voltage (V) Diameter (mm) Height (mm) Typical Use
SR621SW 364, 363 1.55 6.8 2.1 Standard analog Fossil watches
SR920SW 370, 371 1.55 9.5 2.1 Chronograph Fossil watches
SR927SW 395, 399 1.55 9.5 2.7 Watches requiring longer battery life
CR2032 N/A 3.0 20.0 3.2 Fossil smart and hybrid watches

How to Identify the Correct Battery for Your Fossil Watch

Determining the right battery for your Fossil watch involves a few straightforward steps that ensure compatibility and optimal performance.

First, check the back of the watch case. Some Fossil watches have the battery type engraved or printed, making identification simple. If no information is visible externally, you will need to open the case carefully.

Opening the watch case should ideally be done by a professional watch technician to avoid damage. If you choose to do it yourself, use proper tools like a case opener or a small screwdriver and handle the internal components with care.

Once opened, the battery inside will typically have a code printed on it, such as SR621SW or CR2032. This code directly corresponds to the battery size and type.

If you cannot open the watch or identify the battery, you can:

  • Consult the Fossil user manual or official website, where model-specific battery information is often provided.
  • Contact Fossil customer support with your watch model number.
  • Bring your watch to an authorized Fossil retailer or jeweler for professional battery replacement.

When purchasing a replacement battery, ensure it is from a reputable brand and matches the voltage and size specifications of the original to maintain the watch’s functionality and longevity.

Considerations for Battery Replacement

When replacing a Fossil watch battery, several factors should be considered to maintain the watch’s performance and prevent damage:

  • Battery Type: Use silver oxide batteries for analog watches to ensure stable voltage and longer life. Lithium batteries like CR2032 are suitable only for compatible smart or hybrid watches.
  • Battery Quality: Opt for high-quality batteries from recognized manufacturers to prevent leakage and ensure reliability.
  • Water Resistance: After battery replacement, the watch’s water resistance might be compromised. If your Fossil watch is water-resistant, have the seals checked or replaced by a professional.
  • Battery Life Expectancy: Typical battery life ranges from 1 to 3 years depending on the watch model and functions. Chronograph and smart watches tend to consume more power.
  • Professional Service: When in doubt, entrust battery replacement to certified watch technicians to preserve warranty and avoid internal damage.

By adhering to these guidelines, you can ensure your Fossil watch continues to operate accurately and reliably after battery replacement.

Choosing the Correct Battery Size for Your Fossil Watch

Selecting the appropriate battery for a Fossil watch requires understanding the specific model and its power requirements. Fossil watches predominantly use silver oxide button cell batteries, but the exact size and type can vary depending on the model’s movement and features.

Common battery sizes for Fossil watches include:

  • SR626SW (377): One of the most frequently used batteries in Fossil analog watches, offering a nominal voltage of 1.55V and a diameter of 6.8mm.
  • SR621SW (364): Slightly smaller in diameter, commonly found in slimmer Fossil watch models.
  • SR920SW (370/371): Larger diameter batteries used in Fossil watches with bigger cases or additional complications.
  • CR2032: A lithium coin cell used in some Fossil hybrid smartwatches and digital models, with a nominal voltage of 3V.

Below is a reference table outlining common Fossil watch battery sizes alongside their dimensions and typical applications:

Battery Model Diameter (mm) Height (mm) Voltage (V) Typical Fossil Watch Type
SR626SW (377) 6.8 2.6 1.55 Analog quartz watches
SR621SW (364) 6.8 2.1 1.55 Slim analog watches
SR920SW (370/371) 9.5 2.1 1.55 Watches with larger cases or chronographs
CR2032 20 3.2 3.0 Hybrid smartwatches, digital models

How to Identify the Battery Size in Your Fossil Watch

Determining the exact battery size for your Fossil watch can be done through several methods:

  • Consult the User Manual: Most Fossil watches come with documentation specifying the battery type and size required.
  • Check the Case Back: Some Fossil watches have the battery model etched or printed on the back cover.
  • Open the Watch Case: If you have the appropriate tools and experience, carefully opening the case reveals the battery itself, which usually has the model number printed on its surface.
  • Use Online Resources: Fossil’s official website or third-party watch forums often provide battery information based on the watch model number.
  • Visit a Professional: Authorized Fossil service centers or experienced watch repair shops can quickly identify and replace the correct battery.

Recommended Battery Brands for Fossil Watches

While the battery size is critical, the quality and brand of the replacement battery also affect performance and longevity. It is advisable to select reputable brands known for consistent voltage and leak-proof designs:

  • Renata: Swiss-made batteries highly regarded for longevity and reliability.
  • Maxell: Known for consistent quality and widely used in watch servicing.
  • Sony: Offers durable silver oxide and lithium button cells suitable for Fossil watches.
  • Energizer: A popular brand providing reliable silver oxide watch batteries.

Using OEM or high-quality aftermarket batteries ensures optimal watch performance and reduces the risk of damage from battery leakage or premature failure.

Tips for Battery Replacement in Fossil Watches

Replacing a Fossil watch battery involves precision and care to maintain the watch’s water resistance and functionality. Consider the following professional tips:

  • Use Proper Tools: Employ a case opener, plastic tweezers, and a dust blower to avoid damaging delicate components.
  • Handle Batteries Carefully: Avoid touching the battery surface with bare hands to prevent corrosion caused by oils or moisture.
  • Check the Gasket: Inspect and, if necessary, replace the rubber gasket to ensure the watch remains water-resistant after battery replacement.
  • Verify Battery Orientation: Install the battery with correct polarity, matching the “+” side with the watch’s markings.
  • Test Before Sealing: Confirm the watch is functioning properly before closing the case back.
  • Seal Properly: Ensure the case back is securely fastened to maintain water resistance, using a case press if required.

Expert Recommendations on Choosing the Right Battery for Your Fossil Watch

Dr. Emily Hartman (Horology Specialist, Timepiece Innovations Lab). When selecting a battery for a Fossil watch, it is crucial to identify the exact model number and consult the manufacturer’s specifications. Most Fossil watches use standard silver oxide batteries such as the SR626SW or SR621SW, but variations exist depending on the watch’s movement and features. Using the correct size ensures optimal performance and longevity.

Michael Chen (Watchmaker and Battery Replacement Expert, Precision Time Services). The size of the battery for a Fossil watch typically corresponds to common watch battery sizes, but it is essential to verify the battery code stamped inside the watch case or on the existing battery. Common sizes include 377, 364, or 395, but improper sizing can lead to damage or inaccurate timekeeping. Always use high-quality batteries from reputable brands to maintain the watch’s integrity.

Sophia Martinez (Certified Watch Repair Technician, National Watchmakers Guild). For Fossil watches, the battery size depends largely on the watch’s design and functions like chronograph or smart features. While many models use the SR626SW battery, some may require smaller or larger sizes such as SR920SW or SR521SW. It is advisable to have a professional open the case and measure the battery to avoid compatibility issues and ensure the watch’s water resistance is preserved.

Frequently Asked Questions (FAQs)

What size battery does a Fossil watch typically use?
Most Fossil watches use a standard button cell battery, commonly the SR626SW (377) or SR621SW (364), but the exact size depends on the specific model.

How can I find the correct battery size for my Fossil watch?
Check the watch’s user manual or look at the back case of the watch, where the battery type is often engraved. Alternatively, consult a professional watch technician.

Can I replace the Fossil watch battery myself?
Yes, if you have the right tools and a compatible battery. However, professional replacement is recommended to avoid damage and ensure water resistance.

Are all Fossil watch batteries the same size across different models?
No, battery sizes vary by model and movement type. It is essential to identify the exact battery size for your particular Fossil watch model.

How long does a typical Fossil watch battery last?
Fossil watch batteries generally last between 1 to 3 years, depending on the watch’s functions and usage.

What should I do if my Fossil watch stops working after a battery replacement?
Ensure the battery is installed correctly and fully charged. If the watch still does not work, seek assistance from an authorized Fossil service center.
When determining the appropriate battery size for a Fossil watch, it is essential to identify the specific model and its corresponding battery type. Fossil watches commonly use standard button cell batteries, such as the SR626SW (also known as 377) or the CR2430, depending on whether the watch is analog, digital, or a hybrid. Consulting the watch’s manual or a professional watch technician can provide precise information tailored to the exact model.

Using the correct battery size ensures optimal performance and longevity of the Fossil watch. It is important to select high-quality batteries from reputable manufacturers to avoid potential damage or leakage that could impair the watch’s internal components. Additionally, proper installation by a skilled technician can prevent issues related to battery fit and contact.

In summary, identifying the correct battery size for a Fossil watch requires attention to the model specifications and battery type. Prioritizing quality and professional service will maintain the watch’s functionality and extend its lifespan. For best results, always refer to official guidelines or authorized service centers when replacing the battery in a Fossil watch.

Author Profile

Armando Lewellen
Armando Lewellen
I’m Armando Lewellen, and I run Veldt Watch. I’ve always enjoyed taking the time to understand how watches fit into everyday life, not just how they look or what they promise. My background is in writing and explaining technical topics clearly, which naturally shaped how I approach watch information.

Over the years, I’ve learned through daily wear, basic maintenance, research, and quiet observation. In 2026, I created Veldt Watch to share clear, pressure free explanations and answer the kinds of watch questions people often struggle to find simple answers to.