Renata 394 SR936SW Batteries – 1.55V Silver Oxide 394 Watch

Product Overview

Renata 394 SR936SW batteries are precision-engineered 1.55V silver oxide cells designed to deliver reliable, long-lasting power for watches and compact electronic devices. Backed by over 50 years of Swiss engineering expertise, these batteries are manufactured in Renata’s state-of-the-art facility in Itingen, Switzerland, where research, development, production, and quality testing are centralized under one roof. Founded in 1952 as a supplier of mechanical components for wristwatches, Renata shifted its focus in the 1970s to developing high-quality silver oxide batteries—now a cornerstone of its reputation for excellence in timekeeping power solutions. This 2-count pack offers a convenient supply for immediate use or future replacements, ensuring you’re never caught without power when you need it most.

As part of the Swatch Group—home to renowned Swiss watch brands like Swatch, Tissot, Longines, and Omega—Renata benefits from deep integration with the watchmaking industry. The company developed its zero-mercury silver oxide line in cooperation with The Federation of the Swiss Watch Industry, ensuring compatibility and performance standards that meet the exacting demands of precision timepieces. Every battery is produced using highly automated processes with extensive quality controls, reflecting Renata’s commitment to consistency and reliability.

Key Features

• Swiss-Made Precision: Manufactured in Switzerland with over seven decades of battery innovation, Renata combines heritage craftsmanship with modern automation to produce dependable power sources trusted by watchmakers worldwide.
• Stable 1.55V Output: Silver oxide chemistry delivers a consistent voltage throughout the battery’s life, which is essential for accurate timekeeping in analog and digital watches, as well as sensitive electronic instruments.
• Zero Mercury, Environmentally Safe: Fully compliant with environmental standards, these batteries contain no mercury, cadmium, or lead, supporting responsible electronics use and easier disposal.
• Advanced Leak-Proof Sealing: Engineered with sophisticated sealing technology to prevent electrolyte leakage, protecting delicate internal components in watches and small devices from corrosion or damage.
• High Capacity Retention: Exhibits low self-discharge, allowing the battery to maintain its charge during storage—ideal for backups or devices used infrequently, such as wall clocks or memory backup systems.
• Optimized for High & Low Drain Devices: Designed to deliver tailored performance whether powering a low-drain watch or a higher-demand device like a keyless entry remote or calculator.
• User-Friendly Packaging: Features a peel-off flap and pre-perforated blister packs, making it easy to separate and access individual batteries without tools or hassle.
• Transparent Freshness Dating: Each battery is clearly marked with a freshness date, so you can be confident you’re installing a new, fully charged cell.

Technical Specifications

• Model: 394 / SR936SW
• Voltage: 1.55V
• Chemistry: Silver Oxide
• Nominal Capacity: 80 mAh
• Diameter: 0.374 in. / 9.5 mm
• Height: 0.106 in. / 2.7 mm
• IEC Designation: SR927
• Quantity: 2-count pack
• Country of Origin: Switzerland
• Certifications: ISO 9001, ISO 14001 (Bureau Veritas, Switzerland, updated Dec. 2020)

Benefits & Use Cases

Renata 394 SR936SW batteries are ideal for a wide range of compact electronics where stable voltage and long service life are critical. They are commonly used in analog and digital watches, calculators, cameras, small toys, car security alarms, keyless entry remotes, personal organizers, and computer memory backup (CMOS) systems. Their high capacity and low self-discharge rate make them especially suitable for devices that remain in storage or are used infrequently, such as emergency equipment or seasonal gadgets. The consistent power delivery ensures reliable operation across both high and low drain applications, adapting to the specific energy demands of each device.

Thanks to their leak-resistant design and durable construction, these batteries help safeguard the internal mechanisms of precision instruments. Whether you’re replacing a watch battery or powering a medical device, Renata’s Swiss-engineered reliability provides peace of mind. The mercury-free formulation also aligns with modern environmental standards, making disposal safer and more sustainable.

Important Notes

This product contains two 394 SR936SW silver oxide batteries in a secure blister pack with pre-perforated sections for easy separation. Always verify device compatibility before installation. For optimal performance and longevity, store batteries in a cool, dry place away from direct sunlight and extreme temperatures. Do not mix old and new batteries or different battery chemistries in the same device, as this can lead to leakage or reduced performance. Used batteries should be recycled or disposed of according to local environmental regulations. Renata batteries are produced at the company’s headquarters in Itingen, Switzerland, under strict quality assurance protocols. Actual battery life may vary depending on usage patterns, device type, and environmental conditions.