English
Views: 0 Author: Site Editor Publish Time: 2026-02-05 Origin: Site
Button cell batteries, also known as coin batteries, are compact power sources widely used in small electronic devices. Despite their small size, they play a critical role in powering precision electronics. This article explains the meaning of button battery model codes, their internal structure, and common application scenarios to help users better understand and select the right button cell.
Button cell batteries are small, round, and flat batteries designed for low-power and long-term applications. They are commonly used in devices that require stable voltage over extended periods, such as watches, calculators, medical devices, memory backup systems, and small electronic accessories.
Their compact size and reliable performance make them ideal for applications where space is limited and consistent power supply is essential.
Button battery model codes provide important information about the battery’s chemistry, size, and performance. The most common prefixes include:
CR: Lithium manganese dioxide batteries with a nominal voltage of 3.0V. They offer high energy density, low self-discharge, and long shelf life.
LR: Alkaline button batteries with a nominal voltage of 1.5V. They are typically used in low-drain devices and are cost-effective.
SR: Silver oxide batteries with a nominal voltage of 1.55V. They provide stable voltage output and are widely used in watches and precision instruments.
The numbers in the model code indicate the battery’s dimensions. For example, in CR2032, “20” represents a diameter of approximately 20 mm, and “32” indicates a thickness of 3.2 mm.
Although button batteries vary in chemistry, their basic structure is similar. A typical button cell consists of:
Positive electrode (cathode) made from materials such as manganese dioxide or silver oxide
Negative electrode (anode) usually made of lithium or zinc
Electrolyte that enables ion movement between electrodes
Separator to prevent short circuits
Metal casing, which also serves as the current collector
The tightly sealed structure helps prevent leakage and ensures stable performance throughout the battery’s service life.
Different button battery chemistries offer different electrical characteristics. Lithium button cells (CR series) provide higher voltage and longer operating life, making them suitable for devices with higher energy demands or long standby requirements.
Alkaline button cells (LR series) are suitable for simple, low-drain devices but have shorter lifespan and less stable voltage output. Silver oxide batteries (SR series) offer excellent voltage stability, making them ideal for precision devices such as watches and medical instruments.
Button cell batteries are widely used in various fields, including:
Wristwatches and clocks
Hearing aids and medical devices
Calculators and remote controls
CMOS memory backup in computers
Car key fobs and security devices
Small IoT and wearable electronics
Choosing the correct battery type ensures optimal device performance and longer service life.
Despite their small size, button batteries must be handled with care. Incorrect installation, short circuits, or exposure to high temperatures can cause leakage or safety risks. Special attention should be given to keeping button batteries away from children, as accidental ingestion can be extremely dangerous.
Always follow the device manufacturer’s recommendations and replace batteries with the correct model and chemistry.
Button batteries should be stored in a cool, dry place and kept in their original packaging until use. Used batteries should be disposed of according to local regulations or recycled through authorized channels to minimize environmental impact.
Button cell batteries may be small, but they are essential components in many modern electronic devices. Understanding their model codes, internal structure, and application scenarios helps users select the right battery and ensure safe, reliable operation. Proper use, storage, and disposal further enhance performance while supporting environmental responsibility.
