389 Button Cell vs. 394 Button Cell

Attribute	389 Button Cell	394 Button Cell
Size	8mm diameter, 3.6mm height	9.5mm diameter, 3.6mm height
Chemistry	Silver oxide	Silver oxide
Voltage	1.55V	1.55V
Capacity	55mAh	75mAh
Common uses	Watches, calculators, small electronic devices	Watches, calculators, small electronic devices

Introduction

Button cells are small, round batteries commonly used in small electronic devices such as watches, calculators, and remote controls. Two popular types of button cells are the 389 and 394. While they may seem similar at first glance, there are key differences between the two that make them suitable for different applications.

Chemistry

The 389 button cell, also known as the SR1130W, is a silver oxide battery that uses silver oxide as the cathode and zinc as the anode. This chemistry allows for a stable voltage output and a long shelf life. On the other hand, the 394 button cell, also known as the SR936SW, is a silver oxide battery that uses the same chemistry as the 389. Both batteries are known for their high energy density and reliable performance.

Size and Shape

One of the main differences between the 389 and 394 button cells is their size and shape. The 389 button cell has a diameter of 11.6mm and a thickness of 3.0mm, while the 394 button cell has a diameter of 9.5mm and a thickness of 3.6mm. This difference in size and shape can affect the compatibility of the batteries with different devices.

Capacity

When it comes to capacity, the 389 button cell typically has a higher capacity than the 394 button cell. The 389 button cell has a capacity of around 80mAh, while the 394 button cell has a capacity of around 55mAh. This means that the 389 button cell can provide more power for a longer period of time compared to the 394 button cell.

Voltage

Both the 389 and 394 button cells have a nominal voltage of 1.55V. This voltage is suitable for powering small electronic devices that require a stable power source. However, it is important to note that the voltage of button cells can drop over time as the battery discharges, so it is important to monitor the voltage levels to ensure proper functioning of the device.

Applications

The 389 button cell is commonly used in devices such as watches, calculators, and medical devices. Its high capacity and stable voltage output make it ideal for devices that require a reliable power source. On the other hand, the 394 button cell is often used in smaller electronic devices such as key fobs, remote controls, and hearing aids. Its compact size and high energy density make it suitable for devices that require a smaller battery.

Conclusion

In conclusion, the 389 and 394 button cells have their own unique attributes that make them suitable for different applications. While the 389 button cell may have a higher capacity and larger size, the 394 button cell is more compact and suitable for smaller devices. Ultimately, the choice between the two will depend on the specific requirements of the device and the desired performance characteristics.