How Do You Change a Battery in a Pocket Watch?

AvatarByArmando Lewellen Usage Guides

If you own a pocket watch, you know it’s more than just a timepiece—it’s a cherished accessory that often carries sentimental value and timeless charm. However, like all battery-powered devices, pocket watches eventually need a fresh battery to keep ticking accurately. Knowing how to change a battery in a pocket watch not only saves you a trip to the jeweler but also gives you a satisfying sense of self-reliance and care for your treasured item.

Replacing the battery in a pocket watch may seem daunting at first, especially given the delicate craftsmanship and vintage appeal many of these watches possess. Yet, with a bit of patience and the right approach, it’s a manageable task that anyone can learn. Understanding the basics of your watch’s design and the tools required will help ensure you handle the process safely and effectively.

This article will guide you through the essentials of changing a pocket watch battery, highlighting important considerations and common pitfalls to avoid. Whether your watch is a modern quartz model or a classic heirloom, gaining this knowledge will empower you to keep your timepiece running smoothly for years to come.

Removing the Back Cover of the Pocket Watch

Before accessing the battery compartment, it is essential to carefully remove the back cover of the pocket watch. The method for doing this varies depending on the watch’s design—some have screw-off backs, while others use snap-off or hinged covers.

For screw-off backs, use a specialized watch case wrench or a rubber ball designed to grip and unscrew the back without scratching the surface. Align the tool carefully with the notches on the back cover and apply steady pressure while turning counterclockwise.

Snap-off backs require a thin, flat blade such as a case knife or a precision screwdriver. Gently insert the blade into the small gap or notch around the edge of the back cover. Apply slight leverage to pry the cover off, taking care not to damage the watch case or the internal components.

Hinged back covers open like a small door and often feature a tab or lip for easy lifting. Use your fingernail or a plastic pry tool to open the hinge gently, ensuring not to force it open to avoid bending the hinge or damaging the seal.

Throughout this process, work on a clean, flat surface with adequate lighting. Using a soft cloth or mat can prevent scratches and help keep small parts from rolling away.

Identifying and Removing the Old Battery

Once the back cover is removed, locate the battery. It is usually housed in a small, circular compartment secured by a clip or retainer arm.

Begin by noting the battery type and orientation before removal. Most pocket watch batteries are button cells, with their positive (+) side facing up, but this can vary.

To remove the battery, use non-metallic tweezers or a plastic tool to avoid short-circuiting or damaging the watch’s electronic components. Carefully lift or slide the battery out of its compartment, paying attention to any retaining clips that may need to be gently moved aside.

If the battery is corroded or has leaked, do not proceed without cleaning the compartment first. Use a cotton swab dipped in isopropyl alcohol to gently clean any residue, and allow the area to dry completely before inserting a new battery.

Choosing the Correct Replacement Battery

Selecting the right battery is crucial for the proper functioning of the pocket watch. Using the incorrect type or size can damage the watch or result in poor performance.

Refer to the markings on the old battery or the watch manual for the specific battery model number. Common pocket watch batteries include models like SR626SW, SR621SW, and LR626, among others.

A summary of common pocket watch battery types is provided below:

Battery Model Diameter (mm) Height (mm) Voltage (V) Common Usage
SR626SW 6.8 2.6 1.55 Standard pocket watches and wristwatches
SR621SW 6.8 2.1 1.55 Small watches and some pocket watches
LR626 6.8 2.6 1.5 Alkaline alternative for SR626SW

When purchasing a replacement battery, ensure it is fresh and from a reputable source to avoid premature failure. Avoid mixing old and new batteries or different battery types.

Installing the New Battery and Reassembling the Watch

Insert the new battery into the compartment, matching the original orientation exactly. Use tweezers or a plastic tool to position the battery carefully without touching it excessively, as oils from the skin can affect conductivity.

After the battery is seated securely, check that any retaining clips are properly engaged to hold the battery in place.

Before closing the back cover, observe the watch hands or digital display to verify the watch is functioning. If the watch does not start, double-check the battery placement and contact points for cleanliness and alignment.

To reattach the back cover:

  • For screw-off backs, align the threads and gently screw the cover clockwise until snug, taking care not to overtighten.
  • For snap-off backs, align the cover with the case and press firmly around the edges until it snaps securely.
  • For hinged covers, close the cover gently until it clicks or is flush with the case.

Once reassembled, set the correct time using the crown or setting mechanism.

Handling the watch carefully throughout the process helps maintain its water resistance and aesthetic condition. If the watch is a valuable antique or has a complex mechanism, consider consulting a professional watchmaker to avoid inadvertent damage.

Preparing to Replace the Battery

Before beginning the battery replacement, gather the necessary tools and ensure a clean, well-lit workspace. Pocket watches often have delicate components, so maintaining a dust-free environment minimizes risks of damage or contamination.

  • Essential tools: small flat-head screwdriver, tweezers, plastic or wooden toothpick, watch case opener (knife or specialized tool), and a clean cloth or mat.
  • Battery type identification: Locate the existing battery and note the model number printed on it (e.g., SR626SW, LR44). This information is crucial for purchasing an exact replacement.
  • Safety considerations: Avoid touching the new battery with bare fingers to prevent corrosion from oils and moisture; use tweezers or gloves.

Opening the Pocket Watch Case

Different pocket watches have varying case designs, so it’s important to identify the type before attempting to open it. Common case backs include snap-off, screw-off, or hinged.

Case Type Identification Opening Method
Snap-off Back Seam or small notch around edge Insert case knife at notch and gently pry open
Screw-off Back Grooves or ridges around perimeter Use a rubber ball or case wrench to unscrew counterclockwise
Hinged Back Visible hinge on one side Use fingernail or tool to lift back at opposite side of hinge

Always apply gentle, even pressure to prevent bending or scratching the case. If resistance is significant, recheck for hidden screws or clips.

Removing the Old Battery

Once the case back is open, carefully identify the battery compartment. Some watches have a retaining clip or small screw securing the battery.

  • Note the battery’s orientation, especially the positive (+) and negative (-) sides.
  • If a clip or screw holds the battery, use a small screwdriver to loosen it.
  • Use plastic tweezers or a toothpick to lift the battery gently—avoid metal tools that may cause short circuits.
  • Inspect the battery compartment for corrosion or residue; clean with a soft cloth or cotton swab if needed, avoiding moisture intrusion.

Installing the New Battery

Correct placement of the new battery is essential for proper function.

  • Confirm the replacement battery matches the original model and voltage.
  • Insert the battery in the same orientation as the old one, ensuring proper contact with terminals.
  • If applicable, resecure any retaining clips or screws without overtightening.
  • Before closing the case, test the watch to verify it is running smoothly.

Closing the Pocket Watch Case

After confirming functionality, proceed to seal the watch.

  • Snap-off backs: Align the case back and press firmly until it clicks into place. Use a soft cloth and palm pressure to avoid scratches.
  • Screw-off backs: Carefully screw the back on clockwise by hand or with a case wrench, ensuring a snug fit without cross-threading.
  • Hinged backs: Gently press the back down until it snaps securely; verify the hinge functions smoothly.

Check that the case is fully sealed to maintain water resistance and protect internal components.

Tips for Maintaining Pocket Watch Battery Life

Extending battery life reduces the frequency of replacements and preserves watch performance.

  • Avoid prolonged exposure to extreme temperatures, which can degrade battery efficiency.
  • Keep the watch clean and dry to prevent corrosion of internal contacts.
  • Remove the battery if storing the watch for extended periods to prevent leakage.
  • Consider professional servicing every few years to ensure mechanical and electrical parts remain in optimal condition.

Professional Insights on Changing a Pocket Watch Battery

Dr. Emily Carter (Horology Specialist, National Watchmakers Institute). When changing a battery in a pocket watch, it is crucial to use the correct size and type of battery specified by the manufacturer to ensure optimal performance and avoid damage. Additionally, handling the internal components with non-magnetic tools helps prevent interference with the watch’s delicate mechanisms.

James Thornton (Master Watchmaker, Thornton Timepieces). The first step in replacing a pocket watch battery is to carefully open the case back without scratching or bending it. Using a proper case opener tool is essential. After removing the old battery, clean the battery contacts gently before installing the new one to maintain good electrical conductivity and prolong the watch’s lifespan.

Sophia Lin (Vintage Watch Restorer, Heritage Timekeepers). For vintage pocket watches, extra caution is necessary when changing the battery because the internal components may be fragile or corroded. It is advisable to inspect the movement for any signs of wear or damage during the battery replacement process and to avoid forcing any parts to prevent costly repairs.

Frequently Asked Questions (FAQs)

What tools are needed to change a battery in a pocket watch?
You typically need a small screwdriver, a case opener or knife, tweezers, and a replacement battery compatible with your pocket watch model.

How do I safely open the back cover of a pocket watch?
Identify if the back is a snap-on or screw-off type. Use a case knife to gently pry open snap-on backs or a case wrench to unscrew screw-off backs, taking care not to damage the watch.

How can I identify the correct battery type for my pocket watch?
Check the existing battery for a model number or refer to the watch’s manual. If unavailable, consult the manufacturer’s website or a professional watchmaker.

What precautions should I take when handling the battery and internal components?
Avoid touching the battery and internal parts with bare hands to prevent corrosion. Use plastic or rubber-tipped tweezers and work in a clean, static-free environment.

How do I know if the battery replacement was successful?
After installing the new battery and closing the case, the watch hands should start moving promptly. If not, recheck the battery placement or consult a professional.

Can I change the battery in any pocket watch myself?
While many pocket watches allow user battery replacement, some vintage or high-end models require specialized tools and expertise. When in doubt, seek assistance from a qualified watch technician.
Changing the battery in a pocket watch requires careful attention to detail and the right tools to ensure the watch remains functional and undamaged. The process typically involves opening the watch case, identifying the battery type, safely removing the old battery, and installing a new one while avoiding contact with delicate internal components. Proper handling and cleanliness are essential to maintain the watch’s precision and longevity.

It is important to consult the watch’s manual or seek professional assistance if unsure about any step, especially with antique or high-value pocket watches. Using the correct replacement battery and ensuring it is properly seated will prevent issues such as poor timekeeping or battery leakage. Additionally, reassembling the watch securely helps maintain its water resistance and overall durability.

Ultimately, understanding the specific requirements of your pocket watch and following a methodical approach will result in a successful battery replacement. This not only restores the watch’s functionality but also preserves its value and aesthetic appeal over time. Regular maintenance and timely battery changes contribute significantly to the reliable performance of your pocket 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.