Renata 317 (SR516SW) — The Ultra-Slim Silver-Oxide Cell for Precision Timekeeping

Renata 317 (SR516SW) is a silver-oxide watch battery engineered for devices where every tenth of a millimeter counts. With an SR516SW profile (about 5.8 mm diameter × 1.6 mm height), it’s built for ultra-thin analog watches and compact instruments that demand reliable 1.55 V power without sacrificing case design or comfort on the wrist. This comprehensive guide explains what makes the 317 unique, how to select and install it correctly, and how to maximize runtime and reliability.

What Sets the Renata 317 Apart

1. Slim Height for Thin Cases: At roughly 1.6 mm tall, the 317 fits designs that cannot accept taller cells. That precise fit preserves caseback closure and water-resistance.
2. Flat, Stable Output: Silver-oxide chemistry provides a steady 1.55 V that keeps analog movements regulated and on time.
3. Swiss Manufacturing: Renata’s consistent quality control helps ensure predictable discharge behavior and minimal batch variation.
4. Low Self-Discharge: Maintains charge on the shelf and in storage, making it a dependable stocking item for service counters.
5. Mercury-Free, Leak-Resistant: Environmentally considerate construction with seals designed to resist electrolyte leaks that could harm movements.

Decoding SR516SW

• SR — silver-oxide, round button cell
• 516 — size family indicating ~5.8 mm diameter and ~1.6 mm height
• SW — optimized for low-drain watch applications

For ultra-slim dress watches and compact analog pieces, the SR516SW footprint is often non-negotiable. Substituting a taller cell risks caseback interference, compromised seals, or pressure on the movement.

Primary Use Cases

• Ultra-thin analog watches: Classic two- or three-hand designs with minimal complications.
• Compact instruments: Small timing devices and specialty tools that specify SR516SW.
• Legacy pieces: Vintage or heritage-style watches designed around thin cell heights.

Performance Expectations

Run time is influenced by movement current draw, complications, lubricants, and environmental conditions. In well-maintained analog movements matched to SR516SW, the 317 provides a predictable service interval with a smooth voltage profile that promotes accurate timekeeping.

Installation Best Practices

• Verify the callout: Confirm the watch (or device) specifies 317 or SR516SW before replacing.
• Mind the polarity: The positive cap typically faces outward; confirm with the diagram or the original cell.
• Handle with care: Use plastic or ceramic tweezers to avoid shorting or marring the case.
• Inspect seals and seats: Ensure the battery clamp and insulators are intact; replace worn gaskets to preserve water-resistance.
• Test current draw: A quick draw test can reveal whether a movement needs cleaning or adjustment.

Storage & Stocking

• Keep cells in original blister packs until needed.
• Store cool and dry, away from temperature swings and humidity.
• Rotate stock by date code to ensure freshest-in, freshest-out.

Why Choose Renata for SR516SW Replacements?

Beyond the chemistry, build precision and consistency matter. Renata’s process controls and leak-resistance help protect thin movements where tolerances are tight and access gaps are small. For service desks, fewer comebacks and predictable behavior reduce bench time and improve customer satisfaction.

Spec Overview (Renata 317)

End-of-Life Signs & Preventive Care

• Slow or erratic timekeeping: A cue that voltage is dropping toward end-of-life.
• Step-second behavior (model-dependent): Some movements step the seconds hand to indicate low battery.
• Moisture ingress or prior damage: Replace gaskets and test if the watch will face water exposure.

Proactive service—clean contacts, verify insulators, and re-seat clamps—helps the 317 perform to spec throughout its service interval.

Bench Tips for Professionals

• Keep thin-case tools handy: Caseback knives and dies sized for slim references reduce risk of cosmetic damage.
• Document current draw: Keeping a log by model helps predict return intervals and anticipate parts.
• Educate customers: Share basic care notes—avoid magnetic fields, extreme heat, and moisture unless the watch is rated and tested.

Bottom Line

The Renata 317 (SR516SW) delivers dependable, stable 1.55 V power in one of the thinnest watch-battery form factors. If your watch specifies SR516SW, choosing a Swiss-made Renata cell helps preserve accurate timekeeping, proper case fit, and long, reliable service intervals. Pair correct sizing with careful installation and smart storage, and you’ll get the performance the designer intended—quiet, precise, and built to last until the next scheduled change.