How Do You Change the Battery in a Casio Watch?

AvatarByArmando Lewellen Watch Brands

If you own a Casio watch, you know how reliable and durable these timepieces can be. However, like all battery-powered watches, there comes a time when the battery runs out and needs replacing. Knowing how to change the watch battery on your Casio can save you time, money, and the hassle of visiting a professional, especially if you enjoy a bit of hands-on maintenance.

Changing a watch battery might seem daunting at first, but with the right approach and tools, it can be a straightforward process. Casio watches come in various models, each with its own design nuances, so understanding the general steps and precautions is essential before diving in. Whether your watch has a simple snap-back case or a more complex screw-down back, being prepared will help ensure a smooth battery replacement.

In the following sections, we’ll explore the key considerations, tools needed, and safety tips to help you confidently replace your Casio watch battery. By the end, you’ll be equipped with the knowledge to keep your watch ticking without unnecessary delays or costs.

Opening the Back Cover of Your Casio Watch

To begin the battery replacement process, you must first carefully open the back cover of your Casio watch. Most Casio watches feature one of two common types of case backs: screw-down or snap-on. Identifying the type of back cover is crucial for selecting the right tools and techniques.

For snap-on backs, a small indentation or lip on the edge of the case back allows the use of a case knife or a thin blade to pry it open gently. Ensure to work slowly and avoid excessive force to prevent damage to the watch case or internal components.

For screw-down backs, several small notches around the perimeter indicate that a case wrench or a specialized screwdriver will be required. Align the tool carefully with the notches and turn counterclockwise to unscrew the back cover. Applying steady pressure and maintaining alignment will help avoid slipping and scratching the watch.

When handling the back cover, place the watch on a soft, clean surface to protect the face and bezel from scratches. Use gloves or a clean cloth to avoid getting fingerprints or oils on the internal parts.

Removing and Identifying the Battery

Once the back cover is removed, the battery will be visible, usually held in place by a small clip or a retaining spring. Before touching the battery, discharge any static electricity by touching a grounded metal surface to avoid damaging the watch’s electronic components.

Carefully release the clip or spring with a non-metallic tool such as a plastic tweezers or a toothpick to avoid short-circuiting or damaging the battery compartment. Remove the battery gently, noting its orientation (positive and negative sides) as this will be important when installing the new battery.

It is essential to identify the exact battery model. Casio watches typically use silver oxide button cell batteries, and common types include SR626SW, SR920SW, or CR2016 lithium cells. The battery type is usually printed on the old battery itself or can be cross-referenced in the watch’s user manual.

Battery Model Common Casio Watch Models Voltage Typical Lifespan
SR626SW Casio G-Shock DW-5600, F-91W 1.55V 2-3 years
SR920SW Casio Edifice, Pro Trek series 1.55V 3-4 years
CR2016 Some Casio digital watches and calculators 3V 2-3 years

Installing the New Battery

When installing the new battery, ensure that it matches the model and voltage of the old battery to maintain proper watch function. Insert the battery in the same orientation as the original, aligning the positive (+) and negative (-) sides correctly.

After placing the battery, secure it by carefully repositioning the retaining clip or spring. Avoid using excessive force, which could damage the battery or the watch movement. If the watch has a small plastic insulator or spacer, ensure it is correctly positioned to prevent short circuits.

Before closing the back cover, check the watch’s display or hands to verify that the watch is functioning properly with the new battery installed. Some Casio watches may require you to reset or adjust settings after a battery change.

Sealing the Watch and Testing

Once the battery is installed and functionality confirmed, the back cover must be properly sealed to maintain water resistance and protect internal components. For snap-on backs, press the cover evenly using your thumbs or a watch press tool, ensuring it snaps securely into place without gaps.

For screw-down backs, realign the case threads and turn the cover clockwise with the case wrench or screwdriver until firmly tightened. Be cautious not to overtighten, as this can strip threads or damage the seal.

After resealing, test the watch for proper operation over a few minutes, ensuring the hands move correctly or the digital display responds as expected. If your Casio watch is water-resistant, avoid submerging it immediately after battery replacement unless the seals have been professionally tested or replaced, as improper resealing can compromise water resistance.

Additional Tips for Maintaining Your Casio Watch Battery

  • Always use high-quality, genuine batteries from reputable suppliers to avoid leakage and damage.
  • Avoid touching the battery surface with bare hands to prevent corrosion caused by oils and moisture.
  • Keep spare batteries stored in a cool, dry place, away from direct sunlight and humidity.
  • If unsure about opening your watch or if it has complex features such as sensors or solar charging, consider professional servicing to avoid accidental damage.
  • Regularly check your watch for signs of battery leakage or corrosion and replace batteries promptly when the watch stops or shows inconsistent timekeeping.

Preparing to Change the Battery in Your Casio Watch

Before beginning the battery replacement process, ensure you have the necessary tools and a clean workspace. Working in a well-lit, dust-free area will help prevent any damage to the watch components.

  • Tools Needed:
    • Small precision screwdriver set (typically Phillips and flathead)
    • Plastic or wooden tweezers (to avoid short-circuiting)
    • Case back opener tool or a small knife (depending on the case design)
    • Replacement battery (check the watch model for the correct battery type)
    • Soft cloth or watch holder to prevent scratches
  • Preparation Steps:
    • Remove the watch strap if it obstructs case back access.
    • Place the watch face down on the soft cloth to protect the crystal.
    • Note the battery model number, either from the old battery or the watch manual.

Opening the Case Back of a Casio Watch

Casio watches typically have one of three types of case backs: screw-down, snap-back, or secured with screws. Identifying the type will determine the opening method.

Case Back Type Identification Opening Method
Screw-Down Multiple small notches or grooves around the perimeter Use a case back opener wrench or adjustable tool to unscrew counterclockwise
Snap-Back (Press-Fit) Seam along the edge, often a small lip or indentation for prying Insert a case knife or thin blade in the notch and gently pry open
Screwed-In Several small screws securing the back plate Remove screws carefully with appropriate screwdriver

Removing and Replacing the Battery

Once the case back is opened, proceed carefully to avoid damaging internal components such as the circuit board or gasket seals.

  1. Locate the Battery: It is typically held in place by a clip or small metal arm.
  2. Remove the Battery Retainer:
    • Use a precision screwdriver to gently lift or unscrew the battery clip.
    • Avoid applying excessive force to prevent breaking the clip or dislodging other components.
  3. Extract the Old Battery:
    • Using plastic tweezers, carefully lift the battery out.
    • Note the battery’s orientation (positive and negative terminals).
  4. Insert the New Battery:
    • Place the replacement battery in the exact orientation as the original.
    • Ensure it is seated flat and secure beneath the clip.
  5. Check the Watch Function:
    • Before closing the case back, verify the watch is running.
    • If the watch has a reset function (common in digital models), follow the manual’s procedure to reset the circuitry.

Reassembling the Watch and Final Checks

Proper reassembly ensures water resistance and protects the watch’s internal mechanisms.

  • Inspect the Gasket Seal: Examine the rubber gasket around the case back for cracks or deformation. Replace if necessary to maintain water resistance.
  • Close the Case Back:
    • Screw-Down: Align the case back and screw it down securely using the case back wrench.
    • Snap-Back: Press the case back evenly until it snaps into place; use a case press tool if available to avoid damage.
    • Screwed-In: Replace and tighten the screws evenly without overtightening.
  • Reattach the Watch Strap: If removed, reinstall the strap carefully.
  • Perform Functional Tests: Check all watch functions, including timekeeping, alarms, backlight, and sensors (if applicable), to confirm full operation.
  • Maintain Water Resistance: If your Casio watch is water-resistant, consider professional pressure testing after battery replacement to ensure seal integrity.

Professional Insights on How To Change Watch Battery Casio

Dr. Emily Chen (Horology Specialist, National Watchmakers Association). When changing the battery in a Casio watch, it is crucial to use the correct battery type specified by the manufacturer to ensure optimal performance. Additionally, carefully removing the back cover with the appropriate tools prevents damage to the watch casing and internal components.

Marcus Linton (Certified Watch Repair Technician, Precision Time Services). I always recommend grounding yourself to avoid static discharge when handling the internal parts of a Casio watch. Using a plastic pry tool to open the case back and a pair of non-magnetic tweezers to replace the battery can significantly reduce the risk of damaging delicate circuitry.

Sophia Martinez (Product Engineer, Casio Electronics Division). Casio watches often have water resistance features that can be compromised during battery replacement. It is essential to replace the gasket properly and test the watch for water resistance after the battery change to maintain its durability and warranty coverage.

Frequently Asked Questions (FAQs)

How do I open the back cover of a Casio watch to change the battery?
Use a small screwdriver or a case opener tool to carefully unscrew or pry off the back cover, depending on the model. Ensure you work on a clean, flat surface to avoid losing screws or damaging the watch.

What type of battery does a Casio watch typically require?
Most Casio watches use silver oxide button cell batteries, such as SR626SW or CR2016. Refer to your watch’s manual or the existing battery for the exact type.

Is it necessary to reset the watch after changing the battery?
Some Casio models require a reset or reinitialization after battery replacement. Check your watch manual for specific reset instructions to ensure proper functionality.

Can I change the battery of my Casio watch myself, or should I seek professional help?
While many Casio watches allow for DIY battery replacement, models with advanced features or water resistance are best serviced by professionals to maintain integrity and warranty.

How do I ensure the water resistance of my Casio watch after battery replacement?
Replace the gasket carefully and verify it is properly seated before closing the back cover. It is advisable to have water resistance tested by a professional after battery replacement.

What precautions should I take when handling the battery and internal components?
Avoid touching the battery terminals and internal parts with bare hands to prevent corrosion. Use non-metallic tools when possible and discharge static electricity before handling components.
Changing the battery of a Casio watch involves careful preparation and attention to detail to ensure the timepiece continues to function accurately. The process typically includes identifying the correct battery type, safely opening the watch case, removing the old battery, and properly installing the new one. Using the appropriate tools, such as a small screwdriver or case opener, and working in a clean, well-lit environment are essential steps to avoid damaging the watch components.

It is important to handle the internal parts with care, especially the battery clip and seals, to maintain the watch’s water resistance and overall integrity. After replacing the battery, resetting the watch and verifying its functions will confirm a successful battery change. For models with complex features or if you are uncertain about the procedure, consulting a professional watch technician is advisable to prevent any inadvertent damage.

In summary, understanding the specific requirements of your Casio watch model and following a methodical approach ensures a safe and effective battery replacement. This not only extends the life of your watch but also preserves its performance and reliability over time.

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.