Renata 357 (SR1154W) Silver‑Oxide Watch Battery

The Renata 357 (also labeled SR44W or SR1154W) is a high‑drain 1.55 V silver‑oxide button cell sized 11.6 × 5.4 mm. It is designed for watches and small electronics that demand steady voltage during bursts of current, such as chronographs, alarms, and backlights.

Key Specs

• Chemistry: Silver‑oxide (mercury‑free)
• Nominal voltage: 1.55 V
• Size: 11.6 mm diameter × 5.4 mm height (IEC SR1154)
• Drain type: High‑drain (W suffix)
• Typical capacity: ~150–165 mAh (varies by load and cutoff)
• Compliance: RoHS; mercury‑free

When to Choose the 357

• Use if your device specifies 357, SR44W, or SR1154W.
• Best for multifunction watches with chronographs, alarms, or illumination.
• Suitable for small electronics that draw intermittent higher currents.

Avoid/Consider Alternatives

• If your device calls for 303, SR44SW, or SR1154SW, choose Renata 303 (low‑drain) instead.
• Avoid alkaline LR44/AG13 substitutes: they have lower nominal voltage under load and shorter runtime, which can affect accuracy and features.

Compatibility & Cross‑Reference

Standard/Brand	Code
IEC	SR1154 (high‑drain W variant)
Common names	357, SR44W, SR44, SR1154W
Renata (low‑drain counterpart)	303 (SR1154SW)
Alkaline same size (not recommended)	LR44, AG13

Note: Some retail packs list “357/303.” For best performance, match the W (high‑drain) or SW (low‑drain) suffix specified by your device.

Performance & Runtime Expectations

• Simple analog watch (no complications): typically 12–24 months.
• Chronograph/alarm watch: about 6–18 months depending on feature use.
• Small electronics (e.g., laser pointer, small LED devices): tens to hundreds of hours depending on current draw.

Actual runtime depends on device current, temperature, and duty cycle.

Installation Tips

1. Confirm the code on the old cell or the device manual: 357/SR44W/SR1154W.
2. Power down the device (if possible) and open the battery compartment carefully.
3. Handle the new cell with plastic tweezers or gloves to avoid skin oils.
4. Match polarity: the flat side is usually positive (+).
5. Inspect and clean contacts; replace case gaskets to maintain water resistance in watches.
6. If the device uses two cells in series, replace both at the same time.

Estimated time: 5–10 minutes for most watches and small devices.

Safety & Recycling

• Keep out of reach of children; button cells present an ingestion hazard.
• Do not recharge, puncture, or dispose of in fire.
• Store in a cool, dry place (10–25°C) in original packaging; avoid shorting the terminals.
• Recycle via battery collection points; do not discard in household trash.

FAQ

What is the difference between 357 and 303?

Both share the same size (SR1154). The 357 (SR44W) is high‑drain for features like chronographs; the 303 (SR44SW) is low‑drain for steady, low‑power loads. Use the type your device specifies.

Can I use an LR44 instead of a 357?

LR44 is an alkaline cell with lower and less stable voltage under load. It will typically provide shorter life and may affect accuracy or functions. A silver‑oxide 357 is recommended where specified.

What does the “W” suffix mean?

“W” indicates a high‑drain silver‑oxide cell optimized to hold voltage during higher current draws. “SW” denotes a low‑drain variant.

How long is the shelf life?

When stored at room temperature in original packaging, silver‑oxide cells typically retain usability for up to about 5 years from manufacture. Check the date code for best results.

My device takes two SR44 cells. Do I need to replace both?

Yes. Replace cells as a set to ensure balanced performance and to reduce the risk of leakage or uneven discharge.