The SR626SW battery is a small but mighty power source commonly found in wristwatches, calculators, medical devices like thermometers, and various small electronic gadgets. When your device stops working or shows signs of power loss, replacing this tiny button cell battery can bring it back to life. This comprehensive guide will walk you through the entire process of SR626SW battery replacement, from identifying the correct battery to proper disposal of the old one.
What is an SR626SW Battery?
The SR626SW is a silver oxide button cell battery with a diameter of 6.8mm and height of 2.6mm. It provides a steady 1.55V output, making it ideal for precision devices like watches. The "SR" indicates it's a silver oxide battery, "626" refers to its size code, and "SW" means it contains sodium hydroxide electrolyte and complies with watch battery standards.
These batteries are known for their stable voltage output and long shelf life, which is why they're preferred for timekeeping devices. Unlike alkaline equivalents (LR626), silver oxide batteries maintain a consistent voltage until they're nearly depleted, ensuring your watch keeps accurate time throughout the battery's lifespan.
Common Devices Using SR626SW Batteries
Watches
Many analog and some digital watches use SR626SW batteries. These include dress watches, sports watches, and everyday timepieces from various manufacturers.
Calculators
Pocket calculators and some scientific calculators rely on button cell batteries like the SR626SW to power their displays and functions.
Medical Devices
Digital thermometers, blood glucose meters, and other small medical devices often use SR626SW batteries for reliable operation.
Small Electronics
Laser pointers, small LED lights, keychain gadgets, and various other compact electronic devices may use SR626SW batteries.
Tools Required for Battery Replacement
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Safety Precautions for Handling Button Batteries
WARNING: Button batteries can be extremely dangerous if swallowed. They can cause severe internal burns in as little as 2 hours and can be fatal. Keep all button batteries away from children and pets. If you suspect a battery has been swallowed, seek emergency medical attention immediately.
Handling Precautions
- Always wash hands before and after handling batteries
- Consider wearing cotton gloves to prevent skin oils from damaging components
- Use plastic tweezers instead of metal ones to avoid short circuits
- Work in a well-lit, clean area away from children and pets
- Never touch both sides of the battery simultaneously with metal tools
Storage and Disposal
- Store unused batteries in their original packaging
- Keep batteries in a cool, dry place away from metal objects
- Never dispose of batteries in regular trash
- Use designated battery recycling facilities or collection points
- Tape the terminals of used batteries before disposal to prevent short circuits
SR626SW Battery Equivalents and Compatibility
The SR626SW battery has several equivalent options that can be used as replacements. Understanding these equivalents ensures you can find a suitable replacement even if the exact SR626SW label isn't available.
| Battery Code | Chemistry | Voltage | Diameter | Height | Common Uses |
| SR626SW | Silver Oxide | 1.55V | 6.8mm | 2.6mm | Watches, calculators |
| 377 | Silver Oxide | 1.55V | 6.8mm | 2.6mm | Watches, calculators |
| 376 | Silver Oxide | 1.55V | 6.8mm | 2.6mm | Digital watches, devices with higher drain |
| AG4 | Alkaline/Silver Oxide | 1.5V/1.55V | 6.8mm | 2.6mm | Various small electronics |
| LR626 | Alkaline | 1.5V | 6.8mm | 2.6mm | Less sensitive devices |
| 177 | Silver Oxide | 1.55V | 6.8mm | 2.6mm | Watches, calculators |
Important Note: While alkaline equivalents (LR626) have the same physical dimensions, they have a lower voltage (1.5V vs 1.55V) and shorter lifespan. For watches and precision instruments, silver oxide batteries (SR626SW, 377, 376) are strongly recommended.
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Step-by-Step SR626SW Battery Replacement Guide
Prepare Your Workspace
Find a clean, well-lit area with a soft surface to work on. Lay down a microfiber cloth to prevent small parts from rolling away. Arrange all your tools within easy reach and ensure you have good lighting.
Identify the Battery Compartment
For watches, the battery is typically accessed through the back cover. For other devices, look for a small compartment usually secured with a tiny screw or snap-fit cover. Check your device's manual if you're unsure about the location.
Open the Battery Compartment
For screw-back watches: Use the appropriate size precision screwdriver to carefully unscrew the back cover. Turn counterclockwise to loosen.
For snap-back watches: Insert a case knife or pry tool at the notch (usually at 6 o'clock position) and gently lever the back open.
For other devices: Use a small screwdriver to remove the battery compartment screw.
Remove the Old Battery
Note the position and orientation of the old battery (which side faces up). Use plastic tweezers to carefully lift out the old battery. Some devices have a small tab or lever to help with removal.
Be careful not to touch any other components inside the device, especially in watches where delicate mechanisms can be easily damaged.
Clean the Contacts (Optional)
If you notice any corrosion (white, green, or blue powdery substance) on the contacts, gently clean them with a cotton swab slightly dampened with isopropyl alcohol. Allow the contacts to dry completely before installing the new battery.
Insert the New Battery
Insert the new SR626SW battery in the same orientation as the old one. In most cases, the positive (+) side faces up (visible when the compartment is open). Use plastic tweezers to position the battery properly.
Ensure the battery sits flat in its compartment and makes good contact with the terminals.
Close the Battery Compartment
For screw-back watches: Carefully align the threads and turn the back cover clockwise until snug. Don't overtighten.
For snap-back watches: Position the cover correctly and press down firmly until it snaps into place.
For other devices: Replace the cover and secure with the screw.
Test the Device
Check if your device is working properly. For watches, make sure the hands are moving or the digital display is functioning. For other devices, test all functions to ensure they're working as expected.
Need Professional Help?
If you're not comfortable replacing the battery yourself, professional watch repair services can do it for you.
Troubleshooting Tips After Battery Replacement
Device Still Not Working
If your device doesn't work after replacing the battery, try these solutions:
- Check that the battery is inserted with the correct polarity (+ side in the right direction)
- Ensure the battery is making good contact with the terminals
- Clean the battery contacts again if necessary
- Try a different brand of battery - some devices are sensitive to slight variations
- For watches, a gentle tap may help restart the movement
Watch Running Fast or Slow
If your watch isn't keeping accurate time after battery replacement:
- Give it 24-48 hours to stabilize - some watches need time to regulate after a battery change
- Check if the watch needs calibration (consult your watch manual)
- Ensure you used a silver oxide (SR626SW) battery and not an alkaline equivalent
- The watch movement may need professional servicing
Battery Drains Quickly
If the new battery dies sooner than expected:
- Check for functions that drain battery (alarms, backlights, etc.) and disable if not needed
- Ensure you're using a fresh, high-quality battery from a reputable brand
- Look for signs of corrosion that might be causing a drain
- The device may have an internal issue causing excessive power consumption
- Some devices may need a reset after battery replacement
Frequently Asked Questions
How long does an SR626SW battery typically last?
The lifespan of an SR626SW battery depends on the device and usage patterns. In watches, they typically last 2-3 years. In devices with higher power demands like calculators with frequent use, they may last 1-2 years. Silver oxide batteries (SR626SW) generally last longer than their alkaline counterparts (LR626).
What's the difference between SR626SW and LR626 batteries?
While physically identical in size (6.8mm x 2.6mm), these batteries differ in chemistry and performance:
- SR626SW: Silver oxide chemistry, 1.55V, stable voltage throughout life, longer lasting, better for watches and precision instruments
- LR626: Alkaline chemistry, 1.5V, voltage drops gradually during use, shorter lifespan, suitable for less sensitive devices
How should I properly dispose of old SR626SW batteries?
Button cell batteries should never be thrown in regular trash as they contain metals that can harm the environment. Proper disposal methods include:
- Take them to a battery recycling center
- Use collection bins at electronics stores, home improvement stores, or office supply stores
- Check if your local waste management service offers battery recycling
- Some watch repair shops will accept old batteries for proper disposal
Before disposal, tape the positive and negative terminals with clear tape to prevent short circuits.
Where can I buy genuine SR626SW batteries?
Genuine SR626SW batteries can be purchased from:
- Jewelry and watch stores
- Electronics retailers like Best Buy
- Pharmacy chains like CVS, Walgreens, or Rite Aid
- Online retailers like Amazon, eBay, or specialty battery websites
- Office supply stores
To ensure you're getting genuine batteries with full capacity, purchase from reputable retailers and check for authentic packaging. Major brands include Energizer, Duracell, Maxell, Renata, and Sony.
Can I replace an SR626SW battery myself or should I go to a professional?
Most SR626SW battery replacements can be done at home with the right tools and careful handling. However, consider professional service if:
- Your watch is expensive, vintage, or has sentimental value
- The watch is water-resistant and needs proper resealing
- You're not comfortable working with small components
- You don't have the proper tools
- The device has other issues besides the battery
Professional replacement typically costs - for basic watches, plus the cost of the battery.
How should I store spare SR626SW batteries?
To maximize shelf life and performance of spare SR626SW batteries:
- Keep them in their original packaging
- Store in a cool, dry place (room temperature is ideal)
- Avoid extreme temperatures
- Keep away from metal objects that could short-circuit them
- Store out of reach of children and pets
Properly stored, SR626SW batteries typically have a shelf life of 5-10 years.
Where to Buy SR626SW Batteries
Online Retailers
Online shopping offers convenience and often the best prices for SR626SW batteries.
Physical Stores
For immediate needs, these brick-and-mortar options stock SR626SW batteries:
- Jewelry and watch stores
- Electronics retailers (Best Buy, etc.)
- Pharmacy chains (CVS, Walgreens)
- Big-box retailers (Walmart, Target)
- Office supply stores
Professional Services
These locations will replace the battery for you:
- Watch repair shops
- Jewelry stores
- Watch kiosks in malls
- Some eyeglass stores
- Battery specialty stores
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Conclusion
Replacing an SR626SW battery is a straightforward process that can save you time and money compared to professional services. With the right tools, proper safety precautions, and a bit of patience, you can easily restore power to your watches, calculators, and other small electronic devices.
Remember to properly dispose of your old batteries through recycling programs and to store spare batteries in a cool, dry place away from children and pets. By following the steps in this guide, you'll be able to confidently replace SR626SW batteries whenever needed, extending the life of your valuable devices.
For best results, always use high-quality silver oxide batteries from reputable manufacturers, and don't hesitate to seek professional help for valuable or complex devices if you're unsure about performing the replacement yourself.
Need More Help?
If you have questions about battery replacement or need additional assistance, consider consulting with a professional watchmaker or battery specialist.
