Renata 373 (SR916SW) — Low‑Drain Silver‑Oxide Watch Battery

The Renata 373 (SR916SW) is a 1.55 V silver‑oxide button cell designed for low‑drain analog watches. Its 9.5 mm × 1.6 mm size fits slim to medium cases and supports precise timekeeping with a steady discharge profile.

Key Specs

• Chemistry: Silver‑oxide (mercury‑free)
• Nominal voltage: 1.55 V
• Size: 9.5 mm diameter × 1.6 mm height (SR916)
• Drain profile: Low‑drain (SW)
• Compliance: RoHS; mercury‑free

Compatibility and Cross‑References

Common equivalents include:

• IEC: SR916SW
• Renata: 373
• Duracell: D373
• Varta: V373
• Energizer/Sony/Maxell: SR916SW

Important: 373 vs 371 vs SR916W

Code	Size	Drain type	Typical use
373 / SR916SW	9.5 × 1.6 mm	Low‑drain	Analog watches without high‑current features
SR916W	9.5 × 1.6 mm	High‑drain	Chronographs/alarms where higher pulse current is needed
371 / SR920SW	9.5 × 2.1 mm	Low‑drain	Watches designed for the taller 2.1 mm cell

Do not substitute 371/SR920SW for 373—it's taller and may damage the caseback or movement. Use SR916W only if your watch specifies a high‑drain cell.

When to Choose This Battery

• Use if your watch calls for SR916SW or 373 and is a simple analog quartz (hours/minutes/seconds, date).
• Avoid if your watch has power‑hungry features (chronograph, alarm, backlight); check the manual—many of these need SR916W (high‑drain).

Performance Expectations

• Service life in typical analog watches: about 1–3 years (2‑hand models last longer; date/second hand reduce life).
• Shelf life: up to ~5 years in unopened packaging at room temperature.
• Voltage stability supports accurate timekeeping throughout most of the discharge curve.

Installation Tips

1. Verify the required size: SR916SW / 373 (check caseback or manual).
2. Work on a clean surface; discharge static. Use non‑metal or insulated tweezers.
3. Observe polarity: the “+” side faces up in most watches.
4. Inspect and replace case gaskets if worn; reseal and pressure‑test water‑resistant watches.
5. Do not touch the cell faces with bare fingers—oils can increase contact resistance.

Safety and Disposal

• Button batteries are a choking and ingestion hazard. Keep away from children and pets.
• Do not recharge, puncture, or heat.
• Recycle according to local regulations; do not dispose of in fire or household trash where prohibited.

FAQs

• Is 371 the same as 373? No. 371 (SR920SW) is 2.1 mm tall; 373 (SR916SW) is 1.6 mm. Use the height your watch specifies.
• Can I use SR916W instead of SR916SW? Only if the manufacturer specifies it. SR916W is high‑drain for functions that need higher pulse current.
• Are alkaline substitutes acceptable? Not recommended. Alkaline cells have lower capacity and a less stable voltage curve than silver‑oxide, which can affect accuracy and lifespan.
• How long will it last? Typically 1–3 years in analog watches; actual life depends on movement load and features.
• Storage tips? Keep in original packaging, cool and dry, away from metal objects. Avoid extreme heat and humidity.