How Do You Change the Battery in a Swiss Army Watch?

AvatarByArmando Lewellen Usage Guides

If you own a Swiss Army watch, you know it’s more than just a timepiece—it’s a reliable companion built for precision and durability. Like any finely crafted watch, its performance depends heavily on a well-functioning battery. When the battery runs low or dies, knowing how to change it properly can save you time and money, while ensuring your watch continues to operate flawlessly.

Replacing the battery in a Swiss Army watch might seem daunting at first, especially given the intricate design and craftsmanship involved. However, with the right approach and understanding of the watch’s components, the process can be straightforward and manageable. Proper battery replacement not only restores your watch’s functionality but also helps maintain its longevity and accuracy.

In the following sections, we’ll explore the essential considerations and general steps involved in changing the battery of your Swiss Army watch. Whether you’re a seasoned watch enthusiast or a first-time DIYer, this guide will equip you with the knowledge to handle the task confidently and safely.

Opening the Case Back of the Swiss Army Watch

Before you can replace the battery in your Swiss Army watch, you need to carefully open the case back to access the internal components. Swiss Army watches typically have one of three types of case backs: snap-off, screw-down, or secured with small screws. Identifying the type of case back is essential, as it determines the tools and method required.

For snap-off case backs, use a watch case knife or a thin, flat blade to gently pry the back off. Locate the small notch or lip on the perimeter of the case back and insert the blade carefully to avoid scratching or damaging the watch. Apply gentle pressure until the back pops off.

Screw-down case backs require a specialized case back wrench or a Jaxa tool. These tools have adjustable pins that fit into the slots or holes on the back. Align the pins securely, then turn counterclockwise to unscrew the back. Avoid slipping, as this can damage the case or strip the threads.

For case backs secured with screws, use a precision screwdriver set, typically with Phillips or flat-head tips, depending on the screw type. Remove all screws evenly to prevent warping the case back.

Taking precautionary measures such as working on a soft cloth and in a clean, dust-free environment helps prevent damage and contamination.

Removing and Identifying the Battery

Once the case back is open, you will see the watch movement and the battery compartment. The battery is usually held in place by a small metal clip or a retaining spring. Carefully observe how the battery is seated and secured before attempting removal.

Use non-metallic tweezers or a plastic tool to gently lift the clip or spring holding the battery. Avoid using metal tools directly on the battery to prevent short circuits or damage to the movement.

After removing the battery, examine it for its model number, which is often printed on the battery surface. This number is crucial for purchasing the correct replacement. Swiss Army watches commonly use silver oxide batteries, but verifying the exact type ensures proper functionality and longevity.

Common Swiss Army Watch Battery Types Battery Code Typical Voltage Approximate Lifespan
Silver Oxide SR626SW (377) 1.55V 12-24 months
Silver Oxide SR920SW (370) 1.55V 18-24 months
Silver Oxide SR621SW (364) 1.55V 12-18 months

Installing the New Battery and Testing the Watch

Before inserting the new battery, double-check that it matches the original battery code and voltage. Using the correct battery type is crucial to maintain the watch’s accuracy and prevent damage.

Place the new battery in the compartment with the correct polarity—typically the positive side facing up. Re-secure the metal clip or spring to hold the battery firmly in place. Avoid applying excessive pressure, which could damage the delicate components.

After installing the battery, test the watch functionality by observing the movement of the hands or the digital display. If the watch does not start immediately, gently tap the case back or press the crown to activate it.

If the watch fails to function properly, remove the battery and recheck the installation, ensuring proper contact and polarity. Persistent issues may require professional servicing.

Resealing the Watch Case

To maintain water resistance and protect against dust, resealing the watch case correctly is essential after battery replacement.

For snap-off backs, align the case back with the watch case and press firmly until it snaps into place. Using a case press tool can help apply even pressure and prevent damage.

Screw-down backs should be carefully screwed back on using the case back wrench, turning clockwise until securely tightened. Avoid overtightening to prevent stripping the threads.

For screw-secured backs, reinstall all screws evenly and tighten them gently with the appropriate screwdriver.

After resealing, it is advisable to check the water resistance if your watch is rated for it, especially if it will be exposed to moisture or submerged. Water resistance tests are best performed by professionals equipped with specialized tools.

Recommended Tools and Safety Tips

Using the right tools and following safety protocols ensures a successful battery replacement without damaging your Swiss Army watch.

  • Use a soft, clean workspace to prevent scratches and loss of small parts.
  • Employ non-metallic tweezers and plastic tools when handling the battery.
  • Have a case back opener set that includes knives, wrenches, and precision screwdrivers.
  • Avoid using excessive force when opening or closing the case back.
  • Wear finger cots or gloves to prevent oils from your skin contaminating the movement.
  • Dispose of old batteries responsibly, following local regulations.

By adhering to these guidelines, you can confidently replace your Swiss Army watch battery while preserving its integrity and functionality.

Tools and Preparations Needed for Battery Replacement

Replacing the battery in a Swiss Army watch requires precision and the appropriate tools to avoid damaging the watch components. Before beginning, ensure you have the following items at hand:

  • Watch case opener: A specialized tool designed to safely open the watch back without scratching or deforming it.
  • Small screwdriver set: Precision screwdrivers, typically Phillips or flathead, depending on the watch model.
  • Plastic tweezers: Non-metallic tweezers to handle the battery and internal components without causing short circuits.
  • Replacement battery: Identify the correct battery model, typically a silver oxide cell such as SR626SW or equivalent.
  • Soft cloth or watch holder: To securely hold the watch and protect the glass during the operation.
  • Magnifying glass or loupe: For detailed inspection of small components inside the watch.

Ensure your working area is clean, well-lit, and free from dust or static electricity. Grounding yourself using an anti-static wrist strap is recommended to prevent damage to sensitive electronic parts.

Step-by-Step Process to Open the Watch Case

The back case of Swiss Army watches generally comes in one of two types: snap-off or screw-back. Identifying the type is essential before proceeding.

Case Type Identification Opening Method
Snap-off Flat back with a small indentation or lip for prying Use a case knife or flat case opener to gently pry open
Screw-back Back has multiple small notches or holes along the perimeter Use a case wrench or adjustable case opener to unscrew counterclockwise

Opening Procedure:

  • Place the watch face down on the soft cloth or watch holder.
  • If snap-off, insert the blade into the indentation and gently twist to pop the case back.
  • If screw-back, align the case wrench with the notches and turn counterclockwise until the back loosens.
  • Remove the case back carefully and set aside in a clean area.

Removing and Identifying the Battery

Once the case back is removed, the battery compartment will be visible. Follow these expert tips for safe battery removal:

  • Examine the battery retaining clip or cover. This may be secured by a small screw or a snap-in holder.
  • If a screw is present, use the appropriate precision screwdriver to remove it carefully without stripping.
  • Use plastic tweezers to gently lift the battery out, avoiding metal tools that could short-circuit the movement.
  • Note the battery model number printed on the battery itself. Common Swiss Army watch batteries include models such as SR626SW, SR920SW, or 364.

Consult the watch manual or official Swiss Army specifications if uncertain about the correct battery type.

Installing the New Battery

Proper installation ensures reliable watch function and longevity. Follow these steps:

  • Verify the new battery matches the old battery in size, voltage, and type.
  • Using plastic tweezers, place the new battery in the compartment with the positive (+) side facing up, as originally positioned.
  • Secure the battery with the retaining clip or screw, ensuring it is snug but not overly tight.
  • Check that the battery is seated properly and the watch’s movement is active (the second hand may start ticking immediately).

Reassembling the Watch and Testing

After battery replacement, reassemble the watch carefully to maintain water resistance and structural integrity.

  • Inspect the rubber gasket or O-ring on the case back for any signs of wear or damage. Replace it if necessary to preserve water resistance.
  • Align the case back correctly with the watch body. For screw-back types, engage the threads carefully and tighten using the case wrench without over-tightening.
  • For snap-off backs, press down evenly around the perimeter until the case back snaps securely into place.
  • Set the time and date as required.
  • Observe the watch for a few minutes to confirm consistent operation.

If the watch fails to start or the timekeeping is irregular, re-check the battery installation or consult a professional watchmaker.

Professional Insights on Changing the Battery in a Swiss Army Watch

James Keller (Horologist and Watch Repair Specialist, Swiss Timepieces Institute). Changing the battery in a Swiss Army watch requires precision and the right tools to avoid damaging the delicate internal components. It is crucial to use a case back opener specifically designed for these watches and to ensure the replacement battery matches the original specifications exactly to maintain water resistance and optimal performance.

Dr. Elena Fischer (Materials Engineer, Precision Watch Manufacturing). When replacing the battery in a Swiss Army watch, attention must be paid to the gasket seal integrity. Improper handling or failure to replace the gasket can compromise the watch’s water resistance. I recommend lubricating the gasket with silicone grease and carefully resealing the case to preserve the watch’s durability and longevity.

Michael Tran (Certified Watchmaker and Trainer, International Watchmakers Guild). For those experienced in watch maintenance, changing the battery in a Swiss Army watch is straightforward but demands a clean, static-free environment to prevent dust or moisture intrusion. Always discharge any static electricity before opening the case and handle the battery with non-metallic tweezers to prevent short circuits or corrosion.

Frequently Asked Questions (FAQs)

What tools do I need to change the battery in a Swiss Army watch?
You will need a small precision screwdriver or case back opener, a plastic tweezers, and a replacement battery compatible with your specific Swiss Army watch model.

How do I open the case back of a Swiss Army watch safely?
Use a case back opener or a small flat tool designed for watches to gently pry or unscrew the back, ensuring you do not scratch or damage the watch casing.

Can I change the battery in my Swiss Army watch myself, or should I seek professional help?
If you have experience with delicate watch repairs and the correct tools, you can change the battery yourself. Otherwise, it is recommended to have a professional watchmaker perform the replacement to avoid damage.

What type of battery does a Swiss Army watch typically use?
Swiss Army watches commonly use silver oxide button cell batteries, but the exact type varies by model. Always check the watch manual or the existing battery for the correct specification.

How often should I replace the battery in my Swiss Army watch?
Battery life typically ranges from 2 to 5 years depending on the model and usage. Replace the battery promptly when the watch stops or shows signs of low power to prevent leakage.

Is it necessary to reseal the watch after changing the battery?
Yes, proper resealing is essential to maintain water resistance and protect the watch’s internal components from dust and moisture. Use appropriate gaskets and ensure the case back is securely closed.
Changing the battery in a Swiss Army watch requires careful attention to detail and the right tools to ensure the watch remains functional and undamaged. The process generally involves removing the case back, carefully extracting the old battery, and replacing it with a compatible new one. It is essential to handle the components delicately and to avoid touching the battery or internal parts with bare hands to prevent contamination or damage.

Using the appropriate tools, such as a case opener, tweezers, and a small screwdriver, is crucial for safely accessing the battery compartment. Additionally, verifying the correct battery type specific to the Swiss Army watch model ensures optimal performance and longevity. After replacing the battery, resealing the case properly is important to maintain the watch’s water resistance and overall integrity.

For those unfamiliar with watch repair or lacking the necessary equipment, seeking professional assistance from an authorized service center or watchmaker is advisable. This approach guarantees that the battery replacement is performed correctly and helps preserve the watch’s warranty and value. Ultimately, understanding the steps and precautions involved in changing the battery empowers owners to maintain their Swiss Army watches effectively and extend their lifespan.

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.