Renata 350 (SR1136W) Silver‑Oxide Watch Battery

The Renata 350 (IEC: SR1136W) is a high‑drain, 1.55 V silver‑oxide button cell for analog watches that draw higher current, such as chronographs or alarm/feature modules. Its stable voltage curve and leak‑resistant, mercury‑free design help protect delicate movements and keep functions accurate over the battery’s life.

At a Glance

• Chemistry: Silver‑oxide (0% mercury)
• Nominal voltage: 1.55 V
• Size: 11.6 mm diameter × 3.6 mm height (SR1136)
• Drain profile: High‑drain (W)
• Use when the watch specifies: 350 or SR1136W

When to Choose It

• Use if your watch manual, case back, or original cell lists 350 or SR1136W.
• Best for watches with chronograph functions, alarms, or other features that cause intermittent current spikes.
• If your watch specifically specifies SR1136SW (low‑drain), choose the SW version for optimal life.

Compatibility and Fit

• Primary codes: Renata 350, SR1136W, IEC SR1136.
• Do not substitute different sizes (e.g., SR1130/389/390 or SR44/357/303) — they will not fit correctly.
• Avoid alkaline look‑alikes (LR1136/LR) — they have poorer voltage stability and shorter life in watches.

Performance Expectations

• Simple three‑hand analog: about 2–3 years under normal use.
• Chronograph or alarm features used occasionally: about 1–2 years.
• Heavy use of alarms/illumination: about 6–12 months.

Actual life varies by movement, feature use, ambient temperature, and watch condition.

Installation Tips

• Match the exact marking: 350 or SR1136W.
• Handle with plastic or non‑metal tweezers to avoid shorting or marring the cell.
• Verify polarity before closing the case (positive side usually faces up).
• Inspect and lubricate case‑back gaskets if water resistance matters; pressure‑test after service.

Storage and Safety

• Store in original packaging in a cool, dry place; avoid heat and humidity.
• Do not refrigerate or freeze (condensation can damage cells).
• Keep away from children; button cells are a choking and ingestion hazard.
• Recycle used batteries according to local regulations.

FAQs

What does the “W” in SR1136W mean?

“W” indicates a high‑drain version designed to handle higher current pulses (e.g., chronograph or alarm). Use “W” if your watch specifies it; choose “SW” for movements that call for low‑drain.

Can I use a low‑drain SR1136SW instead?

Low‑drain cells may underperform in watches that need current spikes, leading to resets or reduced life. Follow the watch’s specified type for best results.

Is an alkaline LR1136 the same as a silver‑oxide SR1136?

No. Alkaline cells have a less stable voltage and shorter life in watches. For accurate timekeeping and reliability, use silver‑oxide (SR) types like the 350/SR1136W.

Will this replace 389/390 or 357/303?

No. Those are different sizes (SR1130 and SR44). Always match SR1136 for diameter and height to ensure a proper fit.

How long is the shelf life?

Silver‑oxide watch cells typically keep for several years in unopened packaging thanks to low self‑discharge. Check the date code and use oldest stock first.