How To Read Button Battery Models: What Are The Differences Between CR, LR, And SR?

Button batteries are widely used in small electronic devices such as watches, calculators, remote controls, medical instruments, and toys. However, many users feel confused when selecting a replacement battery because of different model codes like CR, LR, and SR. Although these batteries may look similar in size, their chemistry, voltage, performance, and applications are quite different.

1. Understanding Button Battery Model Codes

A typical button battery model consists of letters and numbers:

• The letters indicate the battery chemistry.

• The numbers indicate the battery dimensions (diameter and thickness).

For example, in CR2032, “20” means a diameter of 20 mm, and “32” means a thickness of 3.2 mm.

2. What Does “CR” Mean?

CR button batteries are lithium manganese dioxide batteries.

Key features:

• Nominal voltage: 3.0V

• High energy density

• Very low self-discharge rate

• Long shelf life (often 5–10 years)

Typical applications:

• Computer motherboards (CMOS batteries)

• Car keys and remote controls

• Medical devices

• Smart meters and IoT devices

CR batteries are ideal for low-current, long-term use where stable voltage and long life are required.

3. What Does “LR” Mean?

LR button batteries are alkaline batteries.

Key features:

• Nominal voltage: 1.5V

• Lower capacity compared to CR and SR batteries

• Voltage drops gradually during discharge

• Lower cost

Typical applications:

• Calculators

• Toys

• Simple electronic products

LR batteries are suitable for low-drain, short-term applications where cost is a major concern.

4. What Does “SR” Mean?

SR button batteries are silver oxide batteries.

Key features:

• Nominal voltage: 1.55V

• Very stable voltage output

• Higher capacity than LR batteries

• Excellent leakage resistance

Typical applications:

• Watches

• Precision instruments

• Medical devices

SR batteries are commonly used in high-precision devices that require stable voltage for accurate performance.

5. Key Differences at a Glance

6. Can CR, LR, and SR Batteries Be Replaced Interchangeably?

In most cases, they are not interchangeable, even if the size is the same. Using the wrong type may cause:

• Device malfunction

• Shortened battery life

• Inaccurate readings (especially in watches)

• Potential safety risks

Always follow the device manufacturer’s battery specification.

Conclusion

Although CR, LR, and SR button batteries may look similar, they differ significantly in chemistry, voltage, performance, and application. Understanding these differences helps users select the correct battery, ensuring optimal device performance, safety, and service life.