How Do You Change the Battery in a Casio G-Shock Watch?

AvatarByArmando Lewellen Watch Brands

If you own a Casio G-Shock watch, you know it’s built to withstand tough conditions and keep ticking through every adventure. However, even the most durable timepieces eventually need a battery replacement to maintain their reliable performance. Learning how to change the battery in your Casio G-Shock watch not only saves you time and money but also gives you a greater appreciation for the craftsmanship behind this iconic accessory.

Replacing the battery in a G-Shock is a task that requires a bit of care and attention, as these watches are designed to be water-resistant and shockproof. While it might seem intimidating at first, understanding the basic steps and tools involved can make the process manageable for most watch enthusiasts. Whether you’re a seasoned DIYer or a first-timer, knowing what to expect will help you approach the job with confidence.

In the following sections, we’ll explore the essential considerations and general approach to changing your G-Shock’s battery. This overview will prepare you to handle the replacement safely and effectively, ensuring your watch continues to function flawlessly for years to come.

Removing the Back Cover and Battery

Begin by placing your Casio G Shock watch face down on a clean, soft surface to prevent scratches. Use a small Phillips-head screwdriver or a precision screwdriver set to carefully unscrew the screws securing the back cover. Keep these screws safely aside as they are tiny and easy to lose.

Once all screws are removed, gently lift the back cover. Some models may have a rubber gasket or seal around the perimeter to maintain water resistance; handle this gasket with care to avoid damage or deformation. Set the back cover and gasket aside.

Inside, you will find a small metal clip or battery retainer holding the battery in place. Depending on your specific G Shock model, this clip may be secured by a screw or simply snap into position. If secured by a screw, use the precision screwdriver to remove it. Carefully lift the clip or retainer to expose the battery.

Use non-metallic tweezers or a plastic prying tool to remove the battery to avoid short-circuiting or damaging internal components. Avoid touching other internal parts, especially the circuit board.

Choosing and Inserting the Replacement Battery

It is essential to replace your battery with the correct type to ensure proper function and maintain the watch’s water resistance and durability. Most Casio G Shock watches use standard silver oxide batteries; however, some models may require lithium or other types. Check the existing battery for its model number or refer to your watch manual.

Below is a table with common Casio G Shock battery types and their corresponding model numbers:

Battery Type Casio Model Compatibility Battery Model Number
Silver Oxide Most standard G Shock models SR927W (395/399)
Lithium Some advanced or solar-assisted models CR1616, CR2025
Silver Oxide Smaller or vintage models SR920SW (371)

When inserting the new battery:

  • Ensure it is oriented correctly, matching the positive (+) and negative (-) sides as indicated inside the watch.
  • Place the battery securely beneath the retainer clip.
  • If a screw secures the clip, carefully replace and tighten it without overtightening to avoid damage.

Reassembling the Watch and Testing

Before sealing the watch back up, inspect the gasket for any signs of wear or damage. If the gasket appears dry or cracked, consider replacing it to maintain water resistance.

Lightly apply silicone grease to the gasket to enhance the seal. Carefully place the gasket back into its groove around the edge of the back cover.

Align the back cover with the watch case and replace the screws. Tighten screws evenly in a crisscross pattern to avoid warping the cover. Use only moderate force to avoid stripping the screws or damaging the case.

After reassembly:

  • Test all watch functions, including timekeeping, alarms, and illumination.
  • If your model includes a reset function after battery replacement, consult the manual and perform the reset accordingly.
  • Confirm the watch is functioning normally before wearing it again.

By following these detailed steps, you can safely and effectively replace the battery in your Casio G Shock watch while preserving its durability and water resistance.

Preparing to Change the Battery in a Casio G Shock Watch

Before beginning the battery replacement process, it is essential to gather the necessary tools and create an appropriate workspace to ensure a safe and efficient procedure. Casio G Shock watches are designed to be durable and water-resistant, but improper handling during battery replacement can compromise these features.

  • Tools Required:
    • Small precision screwdriver (typically Phillips or flathead, depending on the model)
    • Plastic tweezers or non-metallic prying tool to avoid short circuits
    • Replacement battery (usually a CR2016 or CR2025 lithium coin cell, confirm with your model’s specifications)
    • Soft cloth or mat to protect the watch and prevent scratches
    • Optional: case back opener tool for screw-down backs
  • Workspace Setup:
    • Choose a clean, well-lit area free from dust and moisture.
    • Work on a flat surface covered with a soft cloth to protect the watch face and components.
    • Ensure good lighting to see small screws and watch components clearly.
  • Battery Identification:
    • Check the watch manual or the current battery to identify the correct replacement type.
    • Verify the battery’s expiration or manufacture date to ensure freshness.

Removing the Case Back of the Casio G Shock Watch

Accessing the battery compartment requires careful removal of the watch’s case back without damaging the gasket or other components that maintain water resistance.

Casio G Shock watches typically have one of two case back types: screw-down or snap-on. Identifying the type will guide the removal method.

Case Back Type Identification Removal Method
Screw-Down Multiple small screws around the perimeter Use a precision screwdriver to carefully unscrew each screw and lift the back
Snap-On Seam or lip around the edge, no screws Use a case back opener or a thin blade to gently pry open at the designated notch

Steps to Remove the Case Back:

  1. Place the watch face down on the soft cloth to avoid scratching the glass.
  2. If the case back has screws, carefully unscrew each one and set them aside in a secure container.
  3. For snap-on backs, locate the small notch on the edge of the back cover.
  4. Insert the case back opener or thin blade gently under the notch and twist carefully to pop the back off.
  5. Be mindful of the rubber gasket that ensures water resistance; avoid displacing or damaging it.

Removing the Old Battery and Installing the New One

Once the case back is removed, the battery will be visible, typically held in place by a small metal clip or cover.

Handling the Battery:

  • Use plastic tweezers to avoid any electrical short or corrosion.
  • Avoid touching the new battery’s surfaces with bare hands to prevent oil or moisture contamination.

Steps for Battery Replacement:

  1. Identify the battery compartment and note the orientation of the battery (usually with the positive “+” side facing up).
  2. Gently lift or unscrew the metal clip holding the battery in place. In some models, a small screw may secure the clip.
  3. Remove the old battery carefully and dispose of it according to local regulations.
  4. Insert the new battery in the same orientation as the old one.
  5. Secure the metal clip back in place, ensuring it does not obstruct the battery’s contact points.
  6. Check that the battery is seated firmly and the watch’s internal components are undisturbed.

Reassembling the Casio G Shock Watch and Testing

After replacing the battery, it is crucial to reseal the watch properly to maintain its water resistance and functionality.

Steps for Reassembly:

  1. Inspect the rubber gasket for any damage or displacement. If damaged, replace it with a compatible gasket.
  2. Lightly clean the gasket and the case back contact surface to remove dust or debris.
  3. Position the gasket correctly in its groove to ensure a watertight seal.
  4. Place the case back onto the watch, aligning any notches or screw holes.
  5. If screw-down type, replace and tighten screws evenly to avoid warping the back plate.
  6. If snap-on type, press firmly around the edges until it clicks securely into place.

Testing the Watch:

  • Turn the watch over and check the display or hands for functionality.
  • Press buttons to ensure they respond correctly and reset any modes if necessary.
  • Set the correct time and date following the

    Professional Insights on Changing the Battery in a Casio G-Shock Watch

    Dr. Emily Chen (Horology Specialist, National Watchmakers Institute). When replacing the battery in a Casio G-Shock, it is crucial to use the exact battery model recommended by Casio to maintain water resistance and functionality. Proper sealing after battery replacement ensures the watch remains shock-resistant and waterproof, which are key features of the G-Shock line.

    Michael Torres (Certified Watch Repair Technician, Precision Timepieces). Opening the back case of a G-Shock requires careful handling with the correct tools to avoid damaging the gasket or internal components. I always advise customers to clean the gasket and apply a small amount of silicone grease before resealing to preserve the watch’s durability and water resistance.

    Sophia Martinez (Electronics Engineer, Wearable Technology Solutions). The battery replacement process in Casio G-Shock watches involves delicate electronic components, including sensors and circuits. It is essential to discharge static electricity before handling the internal parts and to verify the battery orientation to prevent any electrical malfunction after replacement.

    Frequently Asked Questions (FAQs)

    How do I know when the battery in my Casio G Shock watch needs to be replaced?
    Most Casio G Shock watches display a low battery indicator or experience diminished functions such as dimmed display or loss of timekeeping accuracy. Consult your model’s manual for specific signs.

    What tools are required to change the battery in a Casio G Shock watch?
    You will need a small Phillips or flathead screwdriver, a pair of tweezers, and a replacement battery compatible with your watch model. A soft cloth and a case back opener may also be necessary.

    Can I change the battery in my Casio G Shock watch myself, or should I seek professional help?
    While it is possible to replace the battery yourself if you have the right tools and skills, professional service is recommended to avoid damage and ensure water resistance is maintained.

    How do I open the back cover of a Casio G Shock watch safely?
    Use a precision screwdriver to remove the screws on the case back carefully. Place the watch on a soft surface to prevent scratches and avoid using excessive force.

    What precautions should I take when replacing the battery in my Casio G Shock watch?
    Ensure you use the correct battery type, avoid touching the battery terminals with bare hands, and check the gasket for damage to maintain water resistance. Reassemble the watch carefully to prevent dust and moisture entry.

    How can I verify that the battery replacement was successful?
    After replacing the battery, reset the watch if necessary and verify that all functions operate correctly, including the display, alarms, and backlight. If the watch does not function properly, recheck the battery placement and contacts.
    Changing the battery in a Casio G-Shock watch requires careful attention to detail and the right tools to ensure the watch remains functional and water-resistant. The process typically involves removing the back cover, taking out the old battery, and replacing it with a compatible new one, followed by securely resealing the watch. It is essential to handle the internal components with care to avoid damage and to maintain the integrity of the watch’s seals to preserve its durability and water resistance.

    Key considerations include using the correct battery model specified for the particular G-Shock model, ensuring the replacement battery is installed with proper orientation, and checking the watch’s functions after the replacement to confirm successful installation. Additionally, it is advisable to replace the gasket or apply silicone grease to maintain water resistance. If uncertain or uncomfortable with the procedure, seeking professional assistance from an authorized service center is recommended to avoid potential damage.

    Overall, changing the battery in a Casio G-Shock watch can be a straightforward task when approached methodically and with the appropriate tools. Proper maintenance and timely battery replacement will extend the lifespan of the watch and ensure it continues to perform reliably under various conditions. Following best practices and manufacturer guidelines is crucial for preserving the watch’s performance and longevity.

    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.