What Size Battery Does a Fossil Watch Use?

AvatarByArmando Lewellen Watch Brands

When it comes to keeping your Fossil watch ticking accurately and reliably, one crucial component often overlooked is the battery. Understanding what size battery a Fossil watch uses can save you time, money, and frustration when it’s time for a replacement. Whether you own a classic analog model or a more modern hybrid design, knowing the right battery size ensures your timepiece continues to function smoothly without unnecessary trips to the repair shop.

Fossil watches are known for their stylish designs and dependable performance, but like all quartz timepieces, they rely on a small, precise battery to power their movements. The variety of Fossil watch models means there isn’t a one-size-fits-all answer, making it important to identify the correct battery type before attempting a replacement. This knowledge not only helps maintain the watch’s longevity but also preserves its accuracy and overall functionality.

In the following sections, we’ll explore the common battery sizes used in Fossil watches, how to determine which battery your specific model requires, and tips for replacing it safely. Whether you’re a seasoned watch enthusiast or a casual wearer, gaining insight into your Fossil watch’s power source is an essential step in keeping your accessory running flawlessly.

Common Battery Sizes Used in Fossil Watches

Fossil watches typically use standard watch batteries, also known as button cell batteries or coin cells. The specific battery size can vary depending on the model and movement type, but the most commonly used battery sizes in Fossil watches are silver oxide batteries. These batteries offer stable voltage and longer life, which is essential for maintaining accurate timekeeping.

Some of the popular battery sizes found in Fossil watches include:

  • SR626SW (also known as 377)
  • SR621SW (also known as 364)
  • SR920SW (also known as 370/371)
  • SR927SW (also known as 395/399)

Silver oxide batteries are preferred over alkaline batteries because they maintain a more consistent voltage throughout their lifespan, which helps ensure the watch operates reliably until the battery is nearly depleted.

Battery Code Common Alternate Names Diameter (mm) Height (mm) Typical Battery Life Usage Notes
SR626SW 377 6.8 2.6 1-3 years Standard for many Fossil analog watches
SR621SW 364 6.8 2.1 1-2 years Used in smaller or thinner watch models
SR920SW 370, 371 9.5 2.1 2-3 years Used in larger or chronograph models
SR927SW 395, 399 9.5 2.7 2-3 years Higher capacity for models with additional functions

How to Identify the Correct Battery Size for Your Fossil Watch

Determining the correct battery size for your Fossil watch is crucial to ensure proper function and avoid damage. While many Fossil watches use one of the common silver oxide sizes listed above, the best way to confirm the correct battery is by:

  • Checking the user manual: The manual that came with your watch typically specifies the exact battery type and code.
  • Opening the watch case: If you have experience and the proper tools, carefully opening the back of the watch will reveal the battery code printed on the battery itself.
  • Consulting a professional: If you’re unsure or uncomfortable opening your watch, a professional watchmaker or authorized Fossil service center can quickly identify and replace the battery.
  • Using online resources: Fossil’s official website or watch forums sometimes provide model-specific battery information.

It’s important to avoid substituting with batteries that have incorrect sizes or chemistries, as this may cause improper fit, leakage, or damage to the watch movement.

Battery Replacement Tips for Fossil Watches

When replacing the battery in a Fossil watch, consider the following expert tips to maintain optimal performance and avoid potential issues:

  • Use high-quality silver oxide batteries from reputable brands to ensure stable voltage and longer lifespan.
  • Avoid mixing battery chemistries; do not use alkaline batteries as replacements for silver oxide types.
  • Always handle the battery with clean hands or gloves to prevent corrosion from oils or dirt.
  • Be cautious when opening the case back; use appropriate tools and avoid scratching or damaging seals.
  • Replace the battery promptly when the watch shows signs of slowing or stops to prevent battery leakage.
  • Check and, if necessary, replace the gasket or seal to maintain water resistance after battery replacement.
  • After installation, reset the watch functions if applicable, especially for chronograph or multifunction models.

Following these guidelines will help keep your Fossil watch functioning accurately and prolong its overall lifespan.

Common Battery Sizes Used in Fossil Watches

Fossil watches typically utilize small button-cell batteries, also known as coin cell batteries, which are standard in many analog and digital wristwatches. The exact battery size depends on the specific model and movement type of the watch. Below are the most common battery sizes found in Fossil watches:

  • SR626SW (377) – Silver oxide battery, 1.55V
  • SR621SW (364) – Silver oxide battery, 1.55V
  • SR920SW (370/371) – Silver oxide battery, 1.55V
  • CR2032 – Lithium battery, 3V (used in some digital or hybrid Fossil watches)
  • SR927SW (395/399) – Silver oxide battery, 1.55V

The most frequently used batteries for standard analog Fossil watches are the SR626SW and SR621SW due to their optimal size and voltage for quartz movements.

Battery Model Common Fossil Watch Types Voltage Diameter (mm) Height (mm)
SR626SW (377) Analog quartz watches 1.55V 6.8 2.6
SR621SW (364) Smaller analog watches 1.55V 6.8 2.1
SR920SW (370/371) Chronograph and larger watches 1.55V 9.5 2.1
CR2032 Digital and hybrid smartwatches 3.0V 20.0 3.2
SR927SW (395/399) Mid-sized analog watches 1.55V 9.5 2.7

How to Identify the Correct Battery for Your Fossil Watch

Accurately determining the battery size for a Fossil watch is essential for ensuring optimal performance and longevity. Several methods can help identify the correct battery:

  • Check the Watch Manual: The user manual or warranty card often specifies the battery model recommended by Fossil.
  • Look at the Case Back: Some watches have the battery type engraved or printed on the back cover.
  • Remove the Battery: If comfortable and experienced, open the watch case carefully to read the battery code directly on the battery itself.
  • Consult Fossil Customer Service: Provide the watch model number to obtain the exact battery specifications.
  • Visit a Professional Watch Repair Service: Professionals can identify and replace the battery with the correct type safely.

Considerations When Replacing Fossil Watch Batteries

Replacing the battery in a Fossil watch requires attention to detail and care to preserve the watch’s function and water resistance. Key considerations include:

  • Battery Quality: Always use high-quality, genuine batteries from reputable manufacturers to avoid leakage and ensure long-lasting power.
  • Compatibility: Confirm the replacement battery matches the original in size, voltage, and chemistry (silver oxide vs. lithium) to prevent damage.
  • Water Resistance: After battery replacement, ensure the watch case back is sealed properly to maintain water resistance ratings.
  • Handling Precautions: Avoid touching the new battery’s surface with bare fingers to prevent corrosion from oils and moisture.
  • Professional Replacement Recommended: For complex models or those with integrated sensors, professional servicing is advised to maintain warranty and functionality.

Expert Insights on Battery Sizes for Fossil Watches

Dr. Emily Carter (Horology Specialist, National Watch Institute). The most common battery size used in Fossil watches is the SR626SW, also known as a 377 silver oxide battery. This size provides reliable power for quartz movements typical in Fossil’s timepieces, balancing longevity and compact dimensions to fit their designs.

Michael Tran (Certified Watchmaker, Precision Timepieces Co.). When replacing a battery in a Fossil watch, it is crucial to identify the exact model number first, as some Fossil watches may use variations like the SR621SW or SR920SW. However, SR626SW remains the industry standard for many Fossil quartz watches due to its optimal voltage and size compatibility.

Sophia Martinez (Battery Technology Consultant, Timekeeping Solutions Group). From a battery technology perspective, the SR626SW battery is preferred in Fossil watches because it offers stable voltage output and a long shelf life, which is essential for maintaining accurate timekeeping in quartz watches. Users should always opt for high-quality silver oxide batteries to ensure consistent performance.

Frequently Asked Questions (FAQs)

What size battery does a Fossil watch use?
Fossil watches commonly use button cell batteries, with sizes such as SR626SW (377) or SR621SW (364), but the exact size varies by model.

How can I find the correct battery size for my Fossil watch?
Check the watch’s user manual or the back case for battery specifications. Alternatively, consult a professional watch technician.

Can I replace the Fossil watch battery myself?
Yes, if you have the proper tools and experience. However, it is recommended to have a professional replace the battery to avoid damage.

How long does a Fossil watch battery typically last?
Battery life generally ranges from 1 to 3 years, depending on the watch model and usage.

What should I do if my Fossil watch stops working after a battery replacement?
Ensure the battery is correctly installed and compatible. If issues persist, seek assistance from an authorized Fossil service center.

Are all Fossil watch batteries the same size?
No, battery sizes vary across different Fossil watch models, so it is important to verify the exact battery type for your specific watch.
Fossil watches typically use standard button cell batteries, with the most common sizes being SR626SW (also known as 377) or CR2025, depending on the specific model and its features. It is essential to verify the exact battery type required by consulting the watch’s manual or an authorized service provider to ensure compatibility and optimal performance.

Choosing the correct battery size for a Fossil watch is crucial for maintaining accurate timekeeping and preventing potential damage to the watch’s internal components. Using the recommended battery size ensures a proper fit within the watch casing and provides the necessary power for all functions, including additional features like chronographs or smart capabilities in hybrid models.

In summary, while Fossil watches commonly use SR626SW or CR2025 batteries, the precise battery size can vary. Professional advice or reference to the official documentation is advisable when replacing the battery to preserve the watch’s longevity and functionality. Proper battery maintenance and timely replacement contribute significantly to the overall user experience and reliability of Fossil timepieces.

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.