Renata 346 (SR712SW) Silver-Oxide Watch Battery

The Renata 346 (SR712SW) is a mercury-free silver-oxide button cell engineered for low-drain analog watches that require an ultra-slim battery. Its size and steady 1.55 V output support precise timekeeping in very thin cases.

Key Specs

• Chemistry: Silver-oxide (mercury-free)
• Nominal voltage: 1.55 V
• Size: ~7.9 mm (diameter) × 1.2 mm (height)
• Drain type: Low-drain (SW)
• IEC code: SR712SW
• Compliance: RoHS

Compatibility and Equivalents

Use only if the watch, movement, or manual specifies 346 or SR712SW. Common equivalents by format:

• Numeric: 346
• IEC: SR712SW
• Brand-style examples: Renata 346, Maxell SR712SW, Sony SR712SW, Panasonic SR712SW, Varta V346, Energizer 346

Do not substitute taller cells such as SR716 (7.9 × 1.6 mm), as the extra height can stress the caseback or movement. Avoid alkaline or lithium coin cells (e.g., LR or CR types), which differ in voltage and discharge behavior.

When to Choose This Cell

• Choose if: The watch calls for 346/SR712SW and is a low-drain analog movement (simple three-hand or date-only).
• Avoid if: The watch specifies a high-drain “W” version (SR712W) or a different size/height; follow the exact marking on the caseback or movement.

Expected Performance

In typical low-drain analog watches, service life is commonly about 1–3 years, depending on movement design, temperature, and complications. Silver-oxide chemistry maintains a stable voltage curve, helping minimize timekeeping drift until near end of life.

Installation Tips

• Confirm the marking: 346 or SR712SW on the caseback, movement, or manual.
• Insert with correct polarity; avoid bending battery tabs or springs.
• Use non-metal tweezers to prevent shorting and cosmetic damage.
• Clean contacts lightly if needed; replace worn caseback gaskets to preserve water resistance.
• After installation, verify timekeeping and any calendar functions before sealing the case.

Storage and Handling

• Store in original, unopened packaging in a cool, dry place (ideally 50–77°F / 10–25°C).
• Avoid heat, humidity, and loose storage with metal objects.
• Rotate stock by manufacturing date codes; silver-oxide cells typically offer a multi-year shelf life when sealed.

Safety and Disposal

• Keep out of reach of children; button cells are a choking and ingestion hazard. Seek immediate medical attention if swallowed.
• Do not recharge, short, puncture, or expose to fire.
• Recycle through appropriate battery collection points; do not dispose of in household trash where restricted.

FAQ

Is 346 the same as SR712SW?

Yes. 346 is the common watch-number designation, while SR712SW is the IEC code indicating silver-oxide chemistry (SR), 7.9 × 1.2 mm size (712), and low-drain (SW).

Can I use SR716 instead of SR712SW?

No. SR716 is taller (~1.6 mm vs. 1.2 mm). Using it can prevent proper caseback closure or damage the movement.

What’s the difference between “SW” and “W” types?

“SW” indicates low-drain cells for simple analog movements. “W” indicates high-drain cells for watches with higher current spikes (e.g., alarms, lights). Use exactly what the watch specifies.

How long will a 346 battery last?

Typically about 1–3 years in a low-drain analog watch, depending on movement, features, and environmental conditions.

Do I need professional installation?

It’s recommended if your watch is water-resistant or vintage. A technician can pressure-test seals and prevent damage to delicate parts.