The SR626SW, also called the 377 battery, is a small silver-oxide cell used in watches, calculators, and other small devices. It gives a steady 1.55 volts, lasts longer than alkaline types, and fits many models like SR66, V377, and AG4. Its small size and reliable power make it a popular choice for everyday gadgets.
SR626SW Overview
The SR626SW battery, also referred to as the 377 watch battery, is a silver-oxide button cell known for its stable 1.55V output and long service life. It is used in wristwatches, calculators, cameras, and other precision devices because it delivers consistent voltage over time, which is basic for accuracy and reliability. Unlike LR626 alkaline cells, which provide a lower capacity and shorter lifespan, the SR626SW offers superior performance in devices requiring long-term, steady power. Its standard size (6.8 mm diameter × 2.6 mm height) and compatibility with equivalents such as 377, SR66, and AG4 make it easy to replace across brands. When replacing, users should ensure proper polarity alignment and avoid mixing old and new batteries to prevent leakage or reduced efficiency.
Technical Specifications
| Parameter | Value / Notes |
|---|---|
| Chemistry | Silver-oxide (Ag₂O/Zn with alkaline electrolyte) – ensures long life and stable output |
| Nominal Voltage | 1.55 V – higher stability compared to LR626 alkaline equivalents |
| Size (D × H) | 6.8 mm × 2.6 mm – industry-standard button cell dimensions |
| Capacity | \~24–28 mAh (varies depending on brand and discharge conditions) |
| Shelf Life | 4–6 years, maintaining charge even in storage |
| Discharge Profile | Flat and stable output until the final stage of its life cycle |
| Common Codes | 377 (used by Renata, Energizer, Maxell, Murata, and other brands) |
Main Features of SR626SW
Stable Voltage Output
The SR626SW provides a consistent 1.55V, which is for devices like watches and calculators that require precision without voltage fluctuations.
Compact and Standard Size
With dimensions of 6.8 mm × 2.6 mm, it fits perfectly in most watch and small electronic battery compartments, ensuring easy replacements.
Long Shelf Life
Designed for durability, the battery can last up to 5–6 years in storage without significant power loss, making it reliable for bulk stocking.
High Energy Density
Delivers ~24–28 mAh capacity, providing extended run times for small devices compared to alkaline equivalents.
Wide Compatibility
Commonly cross-referenced as 377, SR66, or AG4, it can replace multiple brand-specific codes, ensuring universal usage.
Reliable Discharge Profile
It maintains flat, stable output until near depletion, reducing sudden failures and supporting consistent device performance.
Different Applications of SR626SW
Wristwatches
The SR626SW is one of the most common watch batteries, chosen for its steady voltage that ensures accurate timekeeping.
Calculators
Its compact size and reliable discharge profile make it ideal for calculators, where long-lasting power is necessary for frequent use.
Cameras
Many compact cameras and light meters use SR626SW cells for consistent performance in exposure measurement and control circuits.
Medical Devices
The battery is often used in small medical instruments such as thermometers, digital blood pressure monitors, and glucose meters.
Toys and Mini Gadgets
Children’s toys, laser pointers, and mini remote controls often rely on SR626SW for lightweight, stable power.
Measuring Instruments
Precision instruments like micrometers, multimeters, and electronic calipers benefit from their long shelf life and stable voltage.
Backup Power in Electronics
Some devices use the SR626SW as a memory backup battery, ensuring data retention when the main power is off.
SR626SW Battery Equivalents and Cross-Reference
The SR626SW battery is known by several names and numbers, which can make replacements confusing. All these codes usually point to the same size and chemistry, so they fit and work the same way.
• SR626SW = 377 = SR66 - This is the low-drain type, made for devices that use steady, low amounts of power.
• SR626W = 376 - This is the high-drain type, made for devices that need higher bursts of power.
Replacement Options for SR626SW
• SR626SW
• SR626W
• V377
• AG4
• LR626
Proper Handling of SR626SW
• Store batteries in a cool, dry place away from direct sunlight.
• Avoid mixing old and new batteries in the same device.
• Do not short-circuit, crush, or disassemble the cell.
• Handle with clean, dry hands to prevent corrosion or residue.
• Keep away from children and pets to avoid accidental swallowing.
• Insert with correct polarity as marked (+ and –).
• Recycle or dispose of used batteries according to local regulations.
Storage and Disposal of SR626SW
Recommended Storage Conditions
Keep SR626SW batteries in a cool, dry place with stable temperatures. Avoid areas exposed to direct sunlight, heat, or moisture, as these conditions can shorten shelf life or cause leakage.
Avoid Mixing with Other Batteries
Do not store SR626SW cells with different types of batteries. Chemical reactions or accidental short circuits can occur if they touch or discharge unevenly.
Child and Pet Safety
Always store button cells in secure containers and out of reach of children and pets. Swallowing these batteries can be dangerous and requires immediate medical attention.
Proper Disposal Methods
Do not throw SR626SW cells in household trash. Instead, bring used batteries to recycling centers or electronic waste collection points to prevent environmental harm.
Environmental Responsibility
Silver-oxide batteries contain materials that can be harmful if not handled correctly. Recycling helps recover valuable metals and reduces waste.
Choosing Between SR626SW and SR626W
When replacing a watch battery, you may see both SR626SW and SR626W listed. They look the same in size but are made for different power needs.
• SR626SW (377, low-drain): Works best in analog watches that use a steady, low amount of power.
• SR626W (376, high-drain): Made for digital watches or models that need short bursts of extra power, such as when using alarms or lights.
• Multi-drain types (377/376): Some newer batteries are designed to cover both low-drain and high-drain needs. These are safe to use if you’re not sure which one your device takes.
Conclusion
The SR626SW (377) battery is a silver-oxide cell valued for its stable voltage, compact size, and long storage life. Used in watches, calculators, and small instruments, it offers reliable performance across many applications. Proper storage, safe handling, and responsible disposal ensure its effectiveness while reducing risks to both devices and the environment.
Frequently Asked Questions [FAQ]
Is SR626SW rechargeable?
No, it is a non-rechargeable silver-oxide battery.
What is the SR626SW operating temperature?
It works best between –10 °C and +60 °C.
How do I know if an SR626SW is low?
Watches may lose time, displays may dim, or devices may stop suddenly.
Can SR626SW be used in water-resistant watches?
Yes, but water resistance depends on the watch seal, not the battery.
How is SR626SW different from LR626?
SR626SW lasts longer and has stable voltage; LR626 drains faster.
How do I identify an SR626SW battery?
The code (377, SR626SW, or brand code) is printed on the battery.