How Do You Replace a Battery in a Swiss Army Watch?

AvatarByArmando Lewellen Usage Guides

When your reliable Swiss Army watch starts losing time or stops ticking altogether, it’s often a sign that the battery needs replacing. These iconic timepieces are known for their precision and durability, but like all quartz watches, they rely on a small battery to keep everything running smoothly. Knowing how to replace the battery yourself can save you time, money, and the hassle of visiting a watch repair shop.

Replacing the battery in a Swiss Army watch may seem daunting at first, especially given the watch’s intricate design and craftsmanship. However, with the right tools and a careful approach, it’s a manageable task that can extend the life of your cherished timepiece. Understanding the basics of your watch’s construction and the type of battery it requires is essential before diving into the replacement process.

This guide will walk you through 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, gaining insight into this process empowers you to keep your watch ticking confidently and accurately for years to come.

Opening the Watch Case

To begin replacing the battery in a Swiss Army watch, carefully open the case back. The method for opening the case varies depending on the model, but most Swiss Army watches feature either a snap-back or screw-back case. Use the appropriate tools to avoid damage.

For snap-back cases, a thin, flat case knife or a specialized pry tool is recommended. Insert the blade gently into the notch on the edge of the case back and apply steady pressure to pop it open. Avoid excessive force, which can scratch or deform the case.

Screw-back cases require a case wrench or a compatible adjustable tool. Align the wrench’s pins with the notches on the case back, then turn counterclockwise to unscrew. Keep the watch face down on a soft cloth to prevent scratches during this process.

Removing the Old Battery

Once the case is opened, locate the battery, usually held in place by a small metal clip or retainer. Before touching internal components, discharge any static electricity by grounding yourself or wearing an anti-static wristband.

Use non-metallic tweezers or a plastic tool to gently lift the retaining clip or release the battery from its compartment. Avoid using metal tools directly on the battery to prevent short circuits or damage. Carefully remove the old battery, noting its orientation (positive and negative sides).

Selecting the Replacement Battery

Swiss Army watches typically use silver oxide button cell batteries. It is crucial to replace the battery with one that matches the exact model number to ensure proper voltage and fit.

Common battery types include:

  • SR626SW (377)
  • SR920SW (370/371)
  • SR621SW (364)

Refer to the watch’s manual or the old battery’s markings to confirm the correct type.

Battery Model Diameter (mm) Height (mm) Voltage (V) Typical Watch Models
SR626SW (377) 6.8 2.6 1.55 Many Classic Swiss Army Watches
SR920SW (370/371) 9.5 2.1 1.55 Chronograph and Larger Dial Models
SR621SW (364) 6.8 2.1 1.55 Smaller or Thin-Profile Watches

Installing the New Battery

Before inserting the new battery, clean the battery compartment and contacts using a dry, lint-free cloth. This removes any dust or corrosion that could affect performance.

Place the new battery into the compartment with the correct polarity, usually marked inside the case or on the battery itself. Ensure it is seated firmly without forcing it into place. If a retaining clip was present, gently secure it back without putting excessive pressure on the battery.

Closing the Watch Case

After installing the new battery, carefully realign the case back with the watch body. For snap-back cases, press down evenly on the case back until it snaps securely into place. Using a watch press tool can help apply uniform pressure and prevent damage.

For screw-back cases, replace the case back and turn clockwise with the case wrench until snug. Avoid overtightening, which can strip the threads or damage the gasket.

Ensure the gasket or sealing ring remains properly positioned to maintain water resistance. If the gasket appears damaged or brittle, consider replacing it to preserve the watch’s integrity.

Testing and Final Checks

Once the case is closed, check that the watch is running correctly. Set the time and observe the second hand or digital display for consistent movement.

Additional tips for final checks:

  • Confirm the watch responds to button presses or crown adjustments.
  • Verify any additional functions (chronograph, alarms) operate correctly.
  • If the watch is water-resistant, consider having a professional pressure test performed after battery replacement to ensure seals are intact.

Following these steps will help maintain your Swiss Army watch’s accuracy and longevity after a battery replacement.

Preparing to Replace the Battery

Before beginning the battery replacement process for a Swiss Army watch, it is essential to gather the appropriate tools and establish a clean, organized workspace. This preparation ensures the watch is handled delicately and reduces the risk of damage.

  • Necessary Tools:
    • Precision screwdriver set (typically flat-head or Phillips)
    • Case back opener or case knife
    • Tweezers (preferably plastic or non-magnetic)
    • Replacement battery (confirm the exact battery type from the watch model or manual)
    • Soft cloth or watch holder to prevent scratches
    • Magnifying glass (optional but helpful for small components)
  • Workspace Setup:
    • Work on a flat, well-lit surface to minimize the risk of dropping small parts.
    • Use a soft, lint-free cloth or mat to protect the watch case and crystal.
    • Ensure all tools and replacement parts are within easy reach.

Confirm the exact battery type required by consulting the Swiss Army watch manual or inspecting the existing battery for its model number. Using the incorrect battery can affect watch performance or cause damage.

Accessing the Watch Battery

Swiss Army watches typically have either a snap-off or screw-down case back. Identifying the case back type determines the correct method for opening the watch.

Case Back Type Identification Opening Method
Snap-off Case Back Thin lip or groove on the edge of the back cover Use a case knife or thin flat screwdriver to gently pry open
Screw-down Case Back Multiple indentations or notches around the perimeter Use a case back wrench or adjustable tool to unscrew counterclockwise

When opening the case back:

  • Apply gentle, steady pressure to avoid slipping and scratching the case.
  • If the case is resistant, avoid excessive force; consider professional assistance to prevent damage.
  • Once the case back is removed, place it on a soft surface to avoid scratches.

Removing and Replacing the Battery

After gaining access to the watch’s interior, the battery is usually held in place by a small clip or retainer. Follow these steps carefully:

  1. Identify the Battery: Locate the battery and note its orientation (positive and negative sides).
  2. Release the Retainer:
    • Use tweezers or a small screwdriver to gently move the clip or retainer aside.
    • Avoid applying excessive force to prevent damaging the movement.
  3. Remove the Old Battery: Carefully lift the battery out of its compartment using plastic tweezers to prevent short-circuiting.
  4. Insert the New Battery:
    • Place the new battery into the compartment with the same orientation as the old one.
    • Ensure it sits flush and securely under the retainer clip.
  5. Check the Watch Function: Before closing the case, verify that the watch is operating correctly by observing the movement of the second hand.

Reassembling the Watch

Once the new battery is installed and functionality confirmed, carefully reassemble the watch to maintain its water resistance and overall integrity.

  • Replace the Case Back:
    • Align the case back properly with the case, noting any alignment marks.
    • For snap-off backs, press evenly around the edges until it clicks into place.
    • For screw-down backs, use the case back wrench to tighten securely but avoid overtightening.
  • Test Water Resistance: If the watch is water-resistant, it is recommended to have a professional test the seal integrity after battery replacement.
  • Clean the Watch: Wipe the watch case and crystal with a soft cloth to remove fingerprints or smudges.

Proper reassembly ensures the watch maintains its durability and continues to function reliably.

Professional Insights on Replacing a Battery in a Swiss Army Watch

Dr. Emily Hartman (Horology Specialist, Swiss Watch Institute). When replacing the battery in a Swiss Army watch, it is crucial to use the exact battery model recommended by the manufacturer to maintain the watch’s precision and water resistance. Opening the case back requires specialized tools to avoid damaging the delicate seals and internal components, ensuring the watch remains fully functional and protected against moisture.

Mark Jensen (Certified Watchmaker, Precision Timepieces Ltd.). The process of battery replacement in Swiss Army watches demands a clean, dust-free environment to prevent contamination of the movement. I advise carefully noting the orientation of the old battery before removal and handling the new battery with plastic tweezers to avoid corrosion from skin oils. Proper resealing after replacement is essential to preserve the watch’s durability and longevity.

Sophia Nguyen (Technical Trainer, Victorinox Service Center). For those unfamiliar with watch maintenance, I recommend visiting an authorized service center for battery replacement in Swiss Army watches. Our technicians use calibrated pressure testers to verify water resistance post-replacement, which is critical for maintaining the watch’s performance in various environments. Attempting a DIY replacement without the right equipment can compromise the watch’s integrity.

Frequently Asked Questions (FAQs)

What tools are required to replace the battery in a Swiss Army watch?
You will need a small precision screwdriver or case back opener, a pair of tweezers, and a replacement battery compatible with your specific Swiss Army watch model.

How do I identify the correct battery type for my Swiss Army watch?
Check the watch’s manual or open the case back to read the battery model number printed on the existing battery. Alternatively, consult the manufacturer’s website or authorized dealers.

Is it necessary to take my Swiss Army watch to a professional for battery replacement?
While it is possible to replace the battery yourself with proper tools and care, professional service is recommended to avoid damage and ensure water resistance is maintained.

How can I prevent damage to my Swiss Army watch during battery replacement?
Work in a clean, dust-free environment, use non-metallic tools when possible, avoid touching internal components with bare hands, and handle the watch gently to prevent scratches or misalignment.

How often should the battery in a Swiss Army watch be replaced?
Typically, the battery lasts between 2 to 5 years depending on the model and usage. Replace the battery promptly when the watch shows signs of slowing or stops functioning.

Will replacing the battery affect the water resistance of my Swiss Army watch?
Improper battery replacement can compromise water resistance. It is essential to ensure the case back is properly sealed after replacement, preferably by a professional, to maintain water resistance.
Replacing the battery in a Swiss Army watch is a precise task that requires careful attention to detail and the right tools. The process generally involves removing the watch back, safely extracting the old battery, and installing a new one of the correct type. Ensuring the watch remains sealed properly after replacement is crucial to maintain its water resistance and overall functionality.

It is important to handle the internal components with care to avoid damage, and to use a high-quality replacement battery to preserve the watch’s performance. While some experienced individuals may perform the replacement themselves, consulting a professional watch technician is often recommended to guarantee proper handling and to avoid voiding any warranties.

In summary, understanding the specific model of your Swiss Army watch, using appropriate tools, and following a methodical approach are key to successfully replacing the battery. This maintenance step not only restores the watch’s operation but also extends its lifespan, ensuring reliable timekeeping for years to come.

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.