Maxell 379 SR521SW 1.5V Silver Oxide Watch Battery

Maxell Silver Oxide Button Cell – SR521SW (379)

The Maxell SR521SW, commonly identified by its size code 379, is a high‑performance silver oxide button cell designed for precision electronic devices. This compact power source delivers a stable 1.55 V output and boasts a capacity of approximately 16 mAh, making it ideal for watches, key fobs, medical monitors, and other low‑drain applications.

Key Technical Specifications

• Voltage: 1.55 V – a standard for silver oxide button cells, ensuring compatibility with most devices that require a 1.5–1.6 V supply.
• Capacity: ≈16 mAh – sufficient to power small electronics for months or even years under typical usage patterns.
• Size Code: 379 / SR521SW – a widely recognized dimension that fits most 3‑mm and 4‑mm button cell holders.
• Chemistry: Silver Oxide (Zn/Ag₂O) – offers excellent energy density, low self‑discharge, and stable voltage over its life cycle.
• Weight: ≈0.5 g per cell – lightweight for portable devices.
• Shelf Life: 10+ years when stored in a cool, dry environment; the silver oxide chemistry resists degradation over time.
• Environmental Compliance: No Mercury (Hg); fully compliant with RoHS and other environmental regulations.
• Packaging: 10‑piece pack – each cell is individually sealed to prevent moisture ingress, ensuring reliability until use.

Applications & Compatibility

The SR521SW’s compact form factor and stable voltage make it a go-to choice for:

• Watches & Clocks: Many quartz watches, especially those with 1.5 V power requirements, rely on the 379 size.
• Key Fobs & Remote Controls: The low current draw and long life are perfect for keyless entry systems.
• Medical Devices: Portable monitors, glucose meters, and hearing aids often use silver oxide button cells for their reliability.
• Consumer Electronics: Small gadgets such as calculators, digital thermometers, and toy devices benefit from the SR521SW’s performance.
• Industrial & Scientific Instruments: Devices requiring a stable voltage over extended periods, like data loggers or sensors, can count on this battery.

Performance Highlights

The silver oxide chemistry delivers several advantages that set the SR521SW apart from alkaline or lithium alternatives:

• Stable Voltage Output: Unlike alkaline cells that drop rapidly, silver oxide maintains a near‑constant voltage until depletion.
• Low Self‑Discharge Rate: The cell can retain most of its charge for years when not in use, reducing the need for frequent replacements.
• High Energy Density: Provides more energy per unit volume compared to many other button cells, extending device runtime.
• Consistent Performance Across Temperatures: Silver oxide cells perform reliably from –20 °C to +60 °C, making them suitable for varied environments.

Environmental & Safety Features

The SR521SW is engineered with sustainability in mind:

• No Mercury (Hg): The battery contains no heavy metals that pose environmental or health risks, aligning with global RoHS directives.
• Recyclable Components: While the silver oxide core is not recyclable in most consumer programs, the cell’s casing can be disposed of safely without hazardous waste concerns.
• Low Toxicity: The materials used are non‑toxic, ensuring safe handling during manufacturing and end‑of‑life disposal.

Handling & Storage Guidelines

To maximize lifespan and performance, follow these simple practices:

• Store in a Cool, Dry Place: Avoid high humidity or temperatures above 40 °C to prevent corrosion.
• Avoid Physical Shock: The button cell is fragile; handle with care during installation.
• Keep Sealed Until Use: Each cell’s protective seal prevents moisture ingress, preserving internal chemistry.
• Do Not Mix With Other Chemistries: Mixing silver oxide cells with alkaline or lithium cells can cause leakage or damage.

Why Choose Maxell SR521SW?

Maxell’s reputation for quality and reliability is evident in every SR521SW unit. The combination of high energy density, low self‑discharge, stable voltage, and environmental compliance makes this button cell a trusted choice for manufacturers and consumers alike.

• Consistent Quality Control: Each batch undergoes rigorous testing to meet international standards.
• Global Availability: The 379 size is widely stocked by distributors worldwide, ensuring easy access for replacement needs.
• Long-Term Support: Maxell’s extensive documentation and technical support help engineers integrate the SR521SW into new designs with confidence.

Conclusion

The Maxell Silver Oxide Button Cell – SR521SW (379) stands out as a premier power source for low‑drain, precision devices. Its robust chemistry, environmental friendliness, and proven performance make it the preferred choice for anyone seeking a reliable, long‑lasting battery solution.