Renata 319 (SR527SW) — Precision Silver-Oxide Battery for Compact Timepieces

Renata 319 (SR527SW) is a silver-oxide button cell crafted for slim, precise analog watches and specialty devices that demand stable voltage over extended periods. Its SR527SW size code indicates a compact 5.8 mm diameter and 2.7 mm height, offering a balance of small footprint with slightly greater capacity than ultra-thin counterparts. Manufactured in Switzerland, the 319 delivers the consistency, reliability, and longevity required by professionals and enthusiasts alike.

Core Specifications

• Chemistry: Silver-oxide, mercury-free
• Nominal Voltage: 1.55 V
• Dimensions: ~5.8 mm diameter × ~2.7 mm height
• Drain Profile: Low-drain (SW), optimized for analog watch movements
• Compliance: RoHS, mercury-free

Understanding SR527SW

The SR527SW designation follows a clear code:

• SR: Silver-oxide chemistry, round form
• 527: Size family (~5.8 mm × 2.7 mm)
• SW: Low-drain for continuous, modest current draw in analog watches

This code ensures compatibility for watches and devices specifically designed for the SR527SW footprint, preventing fitment issues that could arise from incorrect sizing.

Advantages of Choosing Renata 319

1. Stable 1.55 V Output: Ensures steady regulation and accurate timekeeping.
2. Swiss Build Quality: Tight manufacturing tolerances guarantee consistent dimensions and performance.
3. Low Self-Discharge: Maintains voltage during extended storage.
4. Leak-Resistant Seals: Designed to protect delicate mechanisms from corrosion.
5. Mercury-Free: Safe for the environment and compliant with global standards.

Applications

• Analog wristwatches requiring SR527SW sizing
• Small timing devices and specialty measuring instruments
• Vintage watches designed for slightly taller cells than SR516SW

Runtime and Reliability

While runtime varies based on movement design and condition, the 319’s additional height allows for a marginally higher capacity than ultra-slim alternatives, extending service intervals for compatible watches. Proper installation, clean contacts, and intact seals help maximize lifespan.

Installation Tips

• Confirm SR527SW is specified before replacement.
• Handle with non-metal tweezers to avoid shorting or surface damage.
• Inspect caseback gaskets and replace as needed to maintain water-resistance.
• Verify polarity before seating the battery in the movement.
• Check current draw to rule out movement issues.

Storage Best Practices

• Keep in original packaging until use.
• Store in cool, dry conditions away from temperature extremes.
• Rotate stock based on date code for freshness.

End-of-Life Indicators

• Loss of accuracy or slow movement
• Second hand stepping in larger intervals (model-dependent)
• Intermittent stoppages

Why Professionals Prefer Renata 319

Watchmakers and service centers value the Renata 319 for its consistent performance, precise fit, and clean manufacturing that minimizes residue risk. In devices where height is critical but extra capacity is beneficial, the 319 strikes an ideal balance.

Conclusion

The Renata 319 (SR527SW) offers a proven, reliable solution for watches and devices calling for this specific size and chemistry. With Swiss engineering, leak-resistant construction, and a stable discharge curve, it ensures optimal performance and longevity in compatible applications.