General
Rated voltage	1,55 V
Diameter	7,9 mm

The VARTA SILVER coin cell type 392 (SR41) is a silver oxide battery for use in electronic devices, particularly in digital and analog watches. As a high-quality branded battery, it provides reliable power supply with constant voltage throughout its entire service life. The battery is part of VARTA’s extensive range of silver oxide cells and is suitable for applications requiring a stable and long-lasting energy source.

Applications

The VARTA V392 is primarily designed for watches, including digital and analog wristwatches, but is also suitable for smaller electronic devices such as calculators, remote controls, or medical measuring instruments. The battery is used in devices requiring low power consumption and high energy density. The silver oxide technology ensures uniform voltage delivery, which is especially important for precise electronic displays and time measurements.

Functions and Features in Detail

The battery delivers a nominal voltage of 1.55 V, which is typical for silver oxide cells and offers higher voltage than alkaline cells of the same size. The typical capacity is 38 mAh, providing sufficient energy supply for watches over an extended period. The compact design with a diameter of 7.9 mm and a height of 3.6 mm fits into most standard watch cases. The battery is supplied as a single cell, without additional packaging or accessories.

Technology Explained Simply

The silver oxide technology (Silver Oxide) is based on a chemical reaction between silver oxide and zinc, delivering high energy density and stable voltage. Compared to alkaline cells, the silver oxide cell offers longer service life and constant voltage, which is particularly advantageous for precise electronic devices. The battery is not rechargeable and serves as a primary battery. The voltage of 1.55 V is optimal for watch applications, as it supports the accuracy of quartz or analog movements.

Compatibility and Accessories

The VARTA V392 (SR41) is compatible with a wide range of devices requiring this cell size. Alternative designations from other manufacturers include 392, D392, SR 41 W, and SR41, highlighting its universal usability in various devices. The battery can be directly inserted into watches or other small electronic devices without requiring additional adapters or converters.

Installation and Mounting

Installation is performed by simply inserting the battery into the device, taking care to observe polarity (positive and negative terminals). The battery is designed for installation in watches, where its small size enables easy handling. No special tools or mounting aids are required. The battery is typically inserted directly into the device without additional packaging or installation instructions.

Operational Advantages

The VARTA V392 offers high reliability and long service life, reducing maintenance frequency for watches and small devices. The constant voltage ensures precise operation, especially in watches that rely on accurate time measurement. The silver oxide technology is designed for low self-discharge, increasing the battery’s shelf life even when stored. The battery is intended for indoor use without special protection requirements such as IP rating.