SR44 Batteries

SR44 Batteries: How to Choose and Use

SR44 batteries are silver oxide button cells known for a stable 1.55V output and long, predictable runtime. They’re ideal for precision devices such as watches, cameras/light meters, calculators, and certain medical tools that depend on consistent voltage.

Key Specifications

Chemistry	Silver Oxide (non‑rechargeable)
Nominal Voltage	1.55V
Typical Capacity	150–200 mAh (varies by brand and drain type)
Size (IEC)	SR1154 — 11.6 mm diameter × 5.4 mm height
Common Names	SR44, 357 (high‑drain), 303 (low‑drain), SR44W (high‑drain), SR44SW (low‑drain)
Operating Range	About −10°C to +60°C (device/brand dependent)
Physical Alkaline Equivalent	LR44/A76/AG13 (same size, different chemistry)

When to Choose SR44

• Use if your device manual lists SR44, 357, 303, SR44W, or SR44SW.
• Use for precision or sensor‑based products that need steady voltage: watches, cameras/light meters, laser sights, glucometers, digital calipers.
• Prefer SR44 over LR44 when long life and consistent readings are important; SR44 holds voltage more steadily as it discharges.

Avoid SR44 if your device requires a different size (e.g., CR2032) or a rechargeable cell. Do not substitute lithium rechargeables (LIR44 ~3.6V) in 1.5V devices.

SR44W vs SR44SW (High‑Drain vs Low‑Drain)

• SR44W / 357 (High‑Drain): Best for devices with higher or varying current draw (e.g., cameras, light meters). Slightly higher pulse capability.
• SR44SW / 303 (Low‑Drain): Optimized for steady, low current devices (e.g., analog watches). Often longest life in these use cases.

Check your device or the old battery’s suffix (W or SW). If unspecified, SR44W generally works across more applications.

SR44 vs LR44 (Alkaline) at a Glance

Feature	SR44 (Silver Oxide)	LR44 (Alkaline)
Voltage Stability	Very stable near 1.55V until near end of life	Gradual voltage drop during use
Runtime	Longer in most devices	Shorter
Cost	Higher	Lower
Best For	Precision instruments	Toys, simple gadgets

Typical Uses and Expected Lifespan

• Analog watch: 2–5 years (longer for low‑drain SR44SW).
• Digital watch with alarms/lighting: ~1–2 years.
• Calculator or digital caliper: 6–24 months (usage dependent).
• Camera light meter/laser sight: Weeks to months of active use; many hours of on‑time between changes.
• Medical testers (e.g., glucometers): ~6–12 months depending on test frequency and model. Always follow device guidance.

Compatibility Checklist

1. Match the size code: SR44 / 357 / 303 / SR1154 printed on the device or old cell.
2. Choose drain type: SW (low‑drain) for steady, low current (watches); W (high‑drain) for intermittent higher current (cameras/meters).
3. Cross‑reference brand codes (e.g., D357, V357). If in doubt, consult the device manual.
4. If your old cell was LR44, you can generally upgrade to SR44 for longer, steadier performance.

Installation and Care

1. Power off the device. Note battery polarity before removal.
2. Use clean, dry hands or non‑metal tweezers to avoid shorting or contaminating the cell.
3. Seat the new battery firmly with correct polarity. Close the compartment fully.
4. If a watch or meter is still inaccurate, check for contact corrosion or have the device serviced.

Storage and Shelf Life

• Store in a cool, dry place in original packaging; avoid heat and humidity.
• Typical shelf life: 3–5 years. Choose recent production dates for best results.
• Do not mix old and new cells or different chemistries in the same device.

Safety and Disposal

• Button cells are a swallowing hazard. Keep away from children and pets. Seek immediate medical attention if swallowed.
• Do not recharge, disassemble, or incinerate.
• Recycle at approved battery collection points; do not discard in household trash.

Alternatives and Notes

• Alkaline LR44/A76/AG13: Same size, lower cost, shorter life and less stable voltage.
• LIR44 (rechargeable lithium): ~3.6V—NOT a safe substitute for 1.55V devices.
• Most modern SR44 cells are mercury‑free; verify packaging if this is important for your application.

FAQ

Are 357 and SR44 the same?

Yes. 357 is a common high‑drain designation for SR44 (silver oxide) cells. 303 denotes the low‑drain variant. All share the SR1154 size.

Can I replace LR44 with SR44?

Usually yes. They are the same size. SR44 typically provides longer life and more stable voltage. Always follow device recommendations.

How long will an SR44 last?

From months to several years depending on device and usage—about 2–5 years in analog watches, and 6–24 months in calculators or meters.

Is SR44 rechargeable?

No. SR44 is a primary (single‑use) silver oxide cell. Do not attempt to charge it or replace it with higher‑voltage rechargeables like LIR44.

What does SR44W vs SR44SW mean?

W indicates high‑drain (e.g., 357) for devices with higher current pulses; SW indicates low‑drain (e.g., 303) for steady, low current use such as analog watches.