SR626SW Equivalent Batteries
The SR626SW has many equivalent and compatible battery designations. Different manufacturers and regions use various labels for the same 6.8×2.6mm silver-oxide cell. Knowing these equivalents helps you find the right replacement wherever you shop.
Battery labeling can be confusing because the same physical cell appears under dozens of names. The IEC (International Electrotechnical Commission) system uses codes like SR626SW, while retailers and manufacturers often use numeric codes such as 377 or 376. Understanding the cross-reference ensures you never buy the wrong battery for your watch or device.
This guide covers every major equivalent and compatible type. Bookmark this page for quick reference when shopping. Share it with friends who struggle with battery confusion. The right knowledge saves time, money, and prevents damage to your devices.
Direct Silver-Oxide Equivalents
These batteries are identical in size and chemistry to the SR626SW. They are fully interchangeable and provide the same 1.55V nominal voltage, 25–28 mAh capacity, and stable discharge characteristics:
- 377 — Common retail label, widely used in North America
- 376 — Alternative designation used by some brands
- 177 — Used by some manufacturers and in older documentation
- SR66 — Older silver-oxide designation before SW standardization
- SR626 — Same battery; SW indicates watch-grade quality per IEC 60086-3
- SG4 — Silver-oxide generic designation
When you see any of these codes on a battery package, you can confidently use it as a replacement for SR626SW in your watch, calculator, or other device. The key is ensuring the package states silver-oxide rather than alkaline.
AG4: Check the Chemistry
AG4 can refer to either silver-oxide or alkaline 6.8×2.6mm batteries. The AG prefix originally indicated a generic size, and both chemistries are made in this size. Always check the package. For watches, choose silver-oxide (often labeled AG4/SR626SW or AG4 Silver Oxide) for best performance.
Alkaline AG4 (same size as LR626) will work in many devices but offers shorter runtime and less stable voltage. In quartz watches, alkaline batteries can cause the second hand to move in two-second jumps as the voltage drops, and the watch may stop sooner than with silver-oxide. For precision timekeeping, silver-oxide is the better choice.
Alkaline Equivalents (Compatible but Not Ideal)
These fit the same compartment but use alkaline chemistry. They have lower capacity (15–17 mAh vs 25–28 mAh) and voltage that drops gradually over time. Acceptable for non-critical devices like calculators or toys; for watches, silver-oxide is preferred:
- LR626 — Alkaline equivalent, most common alkaline option
- LR66 — Alternative alkaline label
Alkaline batteries typically have a shorter shelf life (3–5 years) compared to silver-oxide (5–10 years). If you store spare batteries, silver-oxide retains its charge longer. For a detailed comparison, see our SR626SW vs LR626 page.
Cross-Reference Table
Dimensions: 6.8mm diameter × 2.6mm height. Nominal voltage: 1.55V (silver-oxide) or 1.5V (alkaline). Cutoff voltage: approximately 1.2V for silver-oxide, 1.0V for alkaline.
| Silver-Oxide | Alkaline |
|---|---|
| SR626SW, 377, 376, 177, SR66, SR626, SG4 | LR626, LR66 |
Regional and Manufacturer Variations
In different countries, you may encounter additional labels. European markets sometimes use different numbering. Japanese manufacturers often print both IEC codes and their own designations. When traveling or ordering from international sellers, the 6.8×2.6mm dimensions and silver-oxide chemistry are the constants to verify.
Some devices list multiple compatible codes in the manual (e.g., SR626SW or 377). This confirms they are interchangeable. If only one code is listed, check our table to find equivalents—you may have more options when shopping.
Tips for Buying the Right Equivalent
When shopping for replacement batteries, always verify the chemistry on the package. Look for silver-oxide or SR626SW explicitly stated. Reputable brands like Maxell, Sony, and Energizer clearly label chemistry. Avoid generic or unbranded batteries that do not specify silver-oxide—they may be alkaline.
Check the expiration date; silver-oxide batteries typically have a 5–10 year shelf life. Buy from authorized retailers or trusted sellers to avoid counterfeits. Multi-packs often offer better value if you have several devices. Store unused batteries in a cool, dry place away from metal objects.
For more comparisons, see our SR626SW vs LR626 and SR626SW vs 377 pages, or compare trusted brands. Need to replace the battery? Our replacement guide walks you through the process.
Frequently Asked Questions About Equivalents
Can I use a 377 battery in a watch that says SR626SW? Yes. 377 and SR626SW are the same battery. Ensure the package states silver-oxide.
Is LR626 the same as SR626SW? Same size, different chemistry. LR626 is alkaline; SR626SW is silver-oxide. For watches, silver-oxide is preferred for longer life and stable voltage.
What if my device only lists AG4? Check the package. AG4 can be silver-oxide or alkaline. For watches, choose silver-oxide AG4. Look for SR626SW or 377 on the label to confirm.
Do equivalents from different brands perform the same? Reputable brands (Maxell, Sony, etc.) produce equivalent quality. Generic or unbranded batteries may vary. See our brands comparison for guidance.
International Shopping Tips
When ordering from international sellers, verify the product listing matches SR626SW or an equivalent. Check that the package states silver-oxide. Some listings use only numeric codes—377, 376, or 177—which are valid for the same battery. Read seller reviews and confirm the battery type before purchase.
Shipping from overseas may take longer, but prices can be competitive. Ensure proper packaging to prevent damage in transit. Button cells are small and can be lost if packaging is inadequate. Reputable sellers ship batteries in protective containers.
Key Takeaways
The SR626SW battery is one of the most versatile and widely used watch batteries in the world. Its 6.8×2.6mm dimensions and silver-oxide chemistry make it the preferred choice for quartz timepieces. Knowing the equivalent codes—377, AG4, LR626, and others—gives you flexibility when shopping and ensures you never pay more than necessary for a replacement.
Always prioritize silver-oxide over alkaline for watches. The performance difference is significant: longer runtime, stable voltage, and better timekeeping accuracy. When the package does not clearly state chemistry, choose another option. Your watch will thank you with years of reliable operation.
Understanding Battery Specifications
The SR626SW delivers 1.55 volts nominal, with capacity of 25–28 mAh. This is sufficient for most quartz movements, which draw microamps in normal operation. The silver-oxide chemistry maintains voltage within a narrow range until near end of life, which is why watch manufacturers recommend it over alkaline.
Shelf life of 5–10 years means you can buy spares in advance. Store them in original packaging or a plastic bag, away from heat and moisture. Avoid storing batteries loose in a drawer with metal objects—contact between terminals can cause discharge or short circuits.
Related Resources
Ready to replace your battery? Our replacement guide walks you through the process step by step. Compare trusted brands to find the best SR626SW for your needs. Wondering about silver-oxide vs alkaline? See our SR626SW vs LR626 comparison. Same battery, different name? Check SR626SW vs 377.