Renata 344 (SR1136SW)

Renata 344 (SR1136SW) Silver‑Oxide Watch Battery

The Renata 344 is a low-drain, 1.55 V silver‑oxide button cell for larger analog watches and timing devices that accept the SR1136 size (11.6 mm diameter × 3.6 mm height). It provides a stable voltage curve for accurate timekeeping and a long service interval. Mercury-free.

Key specs

Chemistry	Silver‑oxide (mercury‑free)
Nominal voltage	1.55 V
Size code	SR1136 (11.6 × 3.6 mm)
Drain type	SW – low drain (for continuous, low-current loads)
Typical use	Analog watches without power‑hungry features (e.g., basic 3‑hand, simple date)

When to choose this battery

• Your watch or device marking reads 344 or SR1136SW.
• Analog movement with steady, low current draw and no bright backlight or loud alarm.
• You want stable 1.55 V output for accurate timekeeping and predictable end‑of‑life.

Avoid or check alternatives if

• The device specifically calls for 350 or SR1136W (high‑drain). Use the high‑drain version instead.
• You only find alkaline LR1136/AG equivalents. These have shorter life and a sloping discharge; not recommended for precise timekeeping.

Compatibility and equivalents

• Industry size: SR1136 (11.6 × 3.6 mm)
• Direct replacement numbers: 344, SR1136SW
• Related: 350 / SR1136W (same size, high‑drain; use only if specified)
• Multi‑drain labels like 344/350 from some brands generally fit and work across both profiles; match your device’s guidance when possible.

Expected performance

In a typical analog wristwatch, expect roughly 2–4 years of service, depending on movement draw, complications (e.g., date), temperature, and how well the case seals are maintained. Voltage remains flat for most of the life, then drops quickly near end‑of‑life for an obvious replacement cue.

Installation tips

1. Confirm the marking (344 or SR1136SW) on the old cell or device manual.
2. Open the case carefully; use non‑metal tweezers to avoid shorting the cell.
3. Check polarity. The positive side (+) typically faces up in watches, but verify your device.
4. Inspect the battery clip and contacts; remove debris with a dry lint‑free swab.
5. If water resistance matters, inspect/replace the case gasket before closing.

Storage and shelf life

• Store in original packaging in a cool, dry place; avoid heat and humidity.
• Do not carry loose cells with metal objects (keys, coins).
• Practice FIFO rotation; button cells typically maintain capacity for several years when stored properly.

Safety and recycling

• Keep out of reach of children. Button cells are a swallowing hazard; seek immediate medical attention if ingested.
• Do not recharge, crush, or incinerate.
• Recycle used cells through local battery collection programs.

FAQ

What is the difference between 344 (SR1136SW) and 350 (SR1136W)?

Both share the same size. 344/SR1136SW is tuned for low‑drain loads (steady, small current). 350/SR1136W is tuned for higher drain (features like bright lights or chimes). Use what your device specifies.

Can I use a multi‑drain 344/350 instead?

Many modern silver‑oxide cells are multi‑drain and compatible with both profiles. If your device is sensitive or under warranty, follow the exact SW or W marking. Otherwise, reputable multi‑drain options generally perform well.

Is an alkaline LR1136 a suitable substitute?

Not recommended. Alkaline cells have lower capacity and a sloping voltage curve, which can reduce accuracy and shorten service life.

How long will a Renata 344 last in my watch?

Typically 2–4 years in a standard analog watch. High‑load features, extreme temperatures, or aged movements can shorten this.

Does the 344 contain mercury?

No. It is mercury‑free and compliant with common environmental regulations.