The SR927W battery is most commonly replaced by the 395/399, AG7, or LR927 batteries, depending on the device’s power requirements. Whether you’re replacing a watch battery, calculator cell, or other small electronics power source, understanding equivalent battery types is essential to avoid performance issues or damage.
Have you ever opened a watch or gadget only to find a tiny battery labeled “SR927W” and had no idea what to replace it with? You’re not alone. This small but mighty silver oxide battery has many equivalents that can be found across different brands and codes, which can be confusing to the average user. From chemistry to voltage output, even slight differences can affect compatibility.
Best Batteries for Replacing the SR927W
When searching for the best SR927W battery replacements, it’s important to choose trusted brands that offer consistent voltage, long shelf life, and quality manufacturing. Here are our top picks:
Energizer 395/399 Silver Oxide Battery
Why we picked it: Energizer is a globally recognized brand known for premium battery performance. The 395/399 model offers excellent power stability and long-lasting performance in watches and precision electronics.
Renata 395 Watch Battery
Why we picked it: Renata, a Swiss manufacturer, delivers superior quality with a focus on watch battery technology. Their 395 silver oxide cell is trusted by luxury watchmakers for its consistent power output.
Maxell SR927W Battery
Why we picked it: Maxell offers reliable battery replacements at an affordable price point. The SR927W equivalent ensures dependable energy delivery, especially in small electronic devices that require steady current flow.
SR927W Battery Code
The SR927W is a silver oxide button cell battery commonly used in watches, calculators, and compact electronic devices. To decode “SR927W,” it’s helpful to break down what each part of the label means.
- “SR” stands for silver oxide, the chemical composition of the battery, which is known for stable voltage and a longer lifespan than alkaline types.
- “927” refers to the dimensions of the battery: approximately 9.5mm in diameter and 2.7mm in height.
- “W” indicates that the battery is designed for high-drain devices that require consistent power over time—such as chronograph watches or medical tools.
Many users confuse SR927W with similar-sounding models like SR927SW. The key difference? The “W” version is high-drain, while the “SW” version is low-drain, intended for simpler devices like analog watches. Installing the wrong one can result in faster battery drain or device malfunction.
Key Specs of the SR927W
- Voltage: 1.55V
- Chemistry: Silver Oxide
- Diameter: 9.5 mm
- Height: 2.7 mm
- Common Names: 395, 399, SR57, AG7, LR927
Understanding these identifiers ensures that you select the most compatible battery replacement, reducing the risk of underperformance or device damage. Always cross-check product specs before purchasing.
Top Equivalent Batteries for SR927W
While SR927W is a specific designation, many manufacturers use alternative names for the same size and specifications. Understanding these equivalents ensures you can confidently find the right replacement without compromising device performance.
Most Common SR927W Battery Equivalents
- 395/399 – The most direct and reliable equivalent. Often used interchangeably with SR927W in high-drain applications.
- AG7 – This is the alkaline version. It fits the same devices but has a shorter lifespan and slightly lower voltage stability.
- LR927 – Another alkaline alternative, less expensive but more prone to voltage drops over time compared to silver oxide versions.
Each of these equivalents is designed to fit devices that originally used SR927W, but there are important differences to note:
- Silver oxide (SR/395/399) cells offer more consistent voltage output, making them ideal for sensitive or high-drain devices.
- Alkaline (AG7, LR927) alternatives are cheaper but shorter-lived, best suited for temporary or low-power applications.
Comparison Table
| Battery Code | Chemistry | Voltage | Drain Type | Lifespan |
| SR927W | Silver Oxide | 1.55V | High-drain | Long |
| 395/399 | Silver Oxide | 1.55V | High-drain | Long |
| AG7 | Alkaline | 1.5V | Low to Med | Moderate |
| LR927 | Alkaline | 1.5V | Low-drain | Short |
When and Why to Choose a Silver Oxide vs Alkaline Equivalent
Choosing between a silver oxide and an alkaline SR927W equivalent isn’t just about price—it’s about performance, lifespan, and how your device functions.
Silver Oxide Batteries: Best for Consistency and Longevity
Silver oxide cells like the SR927W or 395/399 are built for high-drain, precision electronics. They offer a stable voltage curve, meaning the battery maintains close to its full power output throughout its life before a sudden drop. This is crucial for:
- Digital watches with backlighting or chronographs
- Medical instruments like glucose meters
- Calculators with LCD displays
- Fitness trackers or remote controls
Pros:
- Long shelf life (up to 10 years)
- Steady voltage
- Reliable performance in critical devices
Alkaline Batteries: Cost-Effective for Simpler Tasks
Alkaline equivalents like AG7 or LR927 are widely available and inexpensive. They’re suitable for low-drain devices where long-term power isn’t as crucial, such as:
- Basic analog watches
- Children’s toys
- Flashing keychains
Cons:
- Voltage drops gradually
- Shorter overall lifespan
- Less reliable in devices requiring consistent output
How to Safely Replace an SR927W Battery
Replacing an SR927W battery might seem simple, but doing it incorrectly can damage your device or reduce battery life. Whether you’re handling a watch, calculator, or medical tool, following proper procedures ensures both safety and efficiency.
Step 1: Power Down the Device
If possible, turn off the device to prevent any electrical short or shock.
Step 2: Use the Right Tools
For watches or electronics, use precision screwdrivers or a watch case opener. Avoid forcing the case open with sharp objects.
Step 3: Remove the Old Battery
Gently lift the battery with a non-metallic tool like a plastic spudger. Be careful not to damage the surrounding circuitry.
Step 4: Inspect the Battery Compartment
Check for any corrosion, dust, or residue. Clean the area with a dry cotton swab or soft brush if necessary.
Step 5: Insert the New Battery
Align the battery with the correct polarity (usually marked with “+” and “-“). Do not force it into place.
Step 6: Test the Device
Power the device on to ensure it’s functioning correctly before sealing it shut.
Step 7: Dispose of Old Battery Properly
Silver oxide batteries are toxic. Recycle them at a battery disposal center or electronics store that offers battery collection.
Safety Tips
- Avoid touching the battery’s surface with bare fingers—oils can cause corrosion.
- Store replacements in a cool, dry place away from children and pets.
- Never mix battery types in the same device.
By taking just a few careful steps, you can extend your device’s life and ensure smooth functionality after replacing the SR927W battery.
Trusted Brands That Offer SR927W Battery Equivalents
Choosing the right brand is just as important as choosing the right battery code. Not all SR927W equivalents are created equal—brand reputation impacts performance, reliability, and safety. Here are the most trusted names offering high-quality alternatives:
Energizer
Energizer is a global leader in battery innovation and a go-to brand for watch and device batteries. Their 395/399 silver oxide battery offers:
- Reliable power output
- Leak-resistant construction
- Long shelf life (up to 10 years)
Ideal For: Watches, glucose monitors, and small electronics where stability matters.
Renata (by Swatch Group)
Renata is favored by luxury watchmakers. Their SR927W batteries are manufactured in Switzerland and meet strict quality controls.
- Designed specifically for high-drain devices
- Excellent for precision timepieces
- Packaged in low-humidity, sealed blister packs
Ideal For: Swiss watches, camera equipment, and hearing aids.
Maxell
Maxell offers a balance of affordability and quality. Their SR927W and LR927 options are widely available and trusted in consumer electronics.
- Stable power output
- Competitive pricing
- Good for general-purpose devices
Ideal For: Key fobs, calculators, and LED toys.
Why Trusted Brands Matter:
- Reduced risk of leakage or swelling
- Better voltage consistency
- Compliance with environmental and safety standards
Opting for reliable battery manufacturers ensures peace of mind, especially in sensitive or high-value devices. Avoid generic or unbranded options, as they often compromise quality for cost.
Conclusion
Replacing an SR927W battery doesn’t have to be confusing—understanding its equivalents like the 395/399, AG7, and LR927 empowers you to make smart, safe choices. From decoding the label to selecting between silver oxide and alkaline types, knowing your options ensures your devices stay powered efficiently.
Whether you’re updating a luxury timepiece or a simple calculator, always prioritize compatibility and quality. Trusted brands like Energizer, Renata, and Maxell deliver proven performance, giving you peace of mind with every replacement.
Choosing the right battery is more than just matching numbers—it’s about protecting your device and maximizing its performance. Always verify specifications and opt for silver oxide options when longevity and consistency matter.
Frequently Asked Questions About SR927W Battery Equivalents
What battery can I use instead of SR927W?
You can replace the SR927W with 395/399, AG7, or LR927 batteries. Among these, 395/399 silver oxide batteries are the most direct and reliable equivalents due to their voltage stability and longer lifespan.
Is SR927W the same as 395 or 399?
Yes. Both 395 and 399 are commonly used as direct equivalents for the SR927W. All three refer to silver oxide button cells with the same dimensions (9.5mm x 2.7mm) and voltage (1.55V). Manufacturers may list either or both numbers depending on the region or drain classification.
Can I use an alkaline battery like AG7 instead of SR927W?
Yes, but with caution. AG7 is an alkaline equivalent that fits the same size slot. However, it offers lower voltage stability and shorter lifespan than silver oxide batteries. It’s best used in low-drain devices only.
What is the difference between SR927W and SR927SW?
The difference lies in power output:
- SR927W is designed for high-drain devices.
- SR927SW is for low-drain applications. Using the wrong one may affect your device’s performance.
Are SR927W batteries rechargeable?
No. SR927W batteries are not rechargeable. They are primary cells meant for single use. Attempting to recharge them can be dangerous and may lead to leakage or rupture.
How long does an SR927W battery last?
Battery life depends on the device, but typically, an SR927W can last 1 to 3 years in a standard watch. Shelf life can be up to 10 years if stored properly.