SR626SW vs LR44
Understanding how SR626SW compares to VS LR44 helps you choose the correct battery for your device. This guide covers the key differences.
Battery confusion is common among watch owners. Similar-looking batteries can have different dimensions or chemistry, and using the wrong one can damage your device or lead to poor performance. This comparison clarifies the relationship between SR626SW and VS LR44.
Size and Chemistry
SR626SW is a small silver-oxide battery (6.8×2.6mm). LR44 is a larger alkaline battery (11.6×5.4mm). They differ in size, chemistry, voltage (1.55V vs 1.5V), and capacity. There is no scenario where one can substitute for the other.
LR44 is one of the most common battery sizes worldwide, used in many watches, calculators, toys, and medical devices. SR626SW is also very common but in different devices. Confusion arises because both are frequently needed—but for different products.
Completely Different
SR626SW is 6.8×2.6mm; LR44 is 11.6×5.4mm. LR44 is much larger. They are not interchangeable. Do not attempt to use LR44 in a device designed for SR626SW or vice versa.
LR44 is nearly twice the diameter of SR626SW and more than twice the height. It would never fit in an SR626SW compartment. SR626SW would be too small and would not make contact in an LR44 device. The confusion arises because both are common battery sizes.
Common Confusion
Both are common watch battery sizes, but for different watches. Always match the size specified by your device. LR44 equivalents include 357, AG13, A76.
If you are unsure which battery your device needs, remove the old battery and check the label. The number printed on the battery (e.g., SR626SW or LR44) will tell you the correct replacement type. SR626SW powers many smaller watches; LR44 is common in larger timepieces and devices like calculators. The size difference is substantial—LR44 will not fit in an SR626SW compartment under any circumstances.
How to Identify Your Battery
The best way to confirm which battery you need is to remove the old one and check the label. Most batteries have the type printed on the positive (top) side. If the label is worn, measure the diameter and height with a ruler or caliper.
Your watch manual or the manufacturer's website may also list the required battery type. When in doubt, take the watch to a jeweler or watchmaker—they can identify the correct battery and replace it if needed.
Practical Tips for Battery Selection
When shopping for replacement batteries, bring the old one if possible. Retail staff can match it visually. If ordering online, double-check the product listing against your device requirements. Dimensions (diameter × height in mm) are the most reliable identifier.
Avoid mixing old and new batteries in multi-battery devices. Replace all batteries at once. Store spares properly: cool, dry place, original packaging. Check expiration dates—batteries past their date may have reduced capacity.
Why Battery Confusion Happens
Watch batteries use multiple naming systems: IEC codes (SR626SW), commercial numbers (377), and generic size codes (AG4). Different regions and manufacturers adopt different conventions. This can make shopping confusing, but once you know the equivalents, you have more options and can often find better deals.
When comparing batteries, focus on dimensions and chemistry first. Size determines fit; chemistry determines performance. A 6.8×2.6mm silver-oxide battery will work regardless of whether the label says SR626SW, 377, or AG4 silver-oxide.
Common Mistakes to Avoid
Never assume batteries with similar numbers are interchangeable. SR626SW and SR621SW both start with SR62, but they have different heights. SR626SW and LR626 share the same size code (626) but different chemistry. Always verify dimensions and chemistry before purchase.
Do not force a battery into a compartment. If it does not fit easily, you likely have the wrong size. Forcing can damage the case, movement, or battery. When in doubt, take the old battery to the store for visual matching, or consult our equivalent batteries page for the correct replacement.
Verifying Your Purchase
After buying, compare the new battery to the old one before discarding the old cell. They should match in diameter and height. If the packaging lists dimensions (e.g., 6.8×2.6mm), verify they match your device requirements. A quick visual check can prevent costly mistakes.
Device Compatibility and Runtime
Device manufacturers specify the exact battery type for a reason. Using the wrong size or chemistry can reduce runtime, damage the device, or void the warranty. Silver-oxide batteries typically last 1–3 years in quartz watches. Alkaline equivalents may last 6–18 months. The correct battery ensures optimal performance.
When replacing batteries, note the orientation of the old cell. Positive usually faces up. Incorrect polarity can prevent the device from working. If the new battery does not fit snugly, double-check that you have the correct type. Loose fit may indicate the wrong size.
Shopping and Installation Tips
When buying replacement batteries, bring the old one to the store if possible. Retail staff can match it visually. If ordering online, verify the product listing matches your device requirements. Dimensions printed on the package (e.g., 6.8×2.6mm) are the most reliable identifier. Avoid generic listings that do not specify size or chemistry.
Handle new batteries with care. Use tweezers to avoid skin contact. Store spares in a cool, dry place. Check expiration dates before use. For replacement instructions, see our replacement guide. Compare trusted brands when choosing a supplier.
Recycling and Disposal
Used watch batteries should be recycled at designated collection points. Many electronics retailers and municipal waste facilities accept button cells. Do not dispose of batteries in regular trash—they contain materials that should be recovered. Proper recycling prevents environmental harm and supports resource recovery.
Keep used batteries in a small container until you can take them to a collection point. Do not mix with new batteries. Store away from children and pets—swallowing button cells is dangerous. Some retailers offer take-back programs when you purchase replacements.
Quick Reference
When unsure which battery your device needs, remove the old one and check the label. The type is usually printed on the positive side. If the label is worn, measure the diameter and height with calipers. Match these dimensions to our equivalent batteries page to find the correct replacement.
Never force a battery into a compartment. If it does not fit easily, you have the wrong size. Forcing can damage the device. When in doubt, take the watch to a jeweler or watchmaker. They can identify the correct battery and replace it professionally if needed.
Summary
Always verify the correct battery type before purchasing. Check your device manual, the old battery label, or consult a retailer. Using the wrong battery can void warranties or cause premature failure. For more comparisons, see our equivalent batteries and brand comparison pages. Need replacement instructions? See our replacement guide.
Related Comparisons
Explore other battery comparisons: SR626SW vs SR621SW (same diameter, different height), SR626SW vs SR616SW (same diameter, thinner), SR626SW vs SR920SW (different size), SR626SW vs LR44 (not interchangeable), SR626SW vs AG4 (chemistry matters).