If you’ve shopped for replacement button-cell batteries, you’ve probably come across both LR44 and AG13. They look the same, cost about the same, and are often used interchangeably in devices like toys, watches, and calculators. But are LR44 and AG13 truly identical? Or are there important differences you should know before using them in your devices?

This article explores the similarities and subtle differences between LR44 and AG13 batteries, explaining when they can be swapped safely and when a closer look is needed.

The Basics: LR44 and AG13 Designations

At first glance, LR44 and AG13 batteries share identical physical characteristics:

• Diameter: 11.6 mm

• Height: 5.4 mm

• Shape: Button cell (cylindrical disc)

• Nominal Voltage: 1.5 volts

• Typical Chemistry: Alkaline

The difference lies in naming conventions, not design:

• LR44: The official IEC (International Electrotechnical Commission) designation.

• AG13: A common manufacturer code, especially in Asia and North America.

Both codes refer to the same size alkaline button-cell battery.

Why the Two Names Exist

The battery industry does not follow one universal naming system. Instead, different standards and companies assign their own codes.

• IEC Code (LR44):

  • “L” = Alkaline chemistry

  • “R” = Round cell

  • “44” = Size code

• AG Code (AG13):

  • “AG” = Alkaline button cell

  • “13” = Size number within the AG series

Because of these different systems, the same battery ends up with multiple names, leading to confusion among consumers.

Equivalent Names Beyond LR44 and AG13

The overlap doesn’t stop with two names. Other common equivalents include:

• A76 (used by Energizer and Duracell)

• L1154

• 1166A (ANSI code)

• LR1154

All of these labels refer to the same alkaline button-cell size. In stores, it’s common to see packaging listing multiple codes together, such as “LR44/AG13/A76,” to make replacements easier.

Chemistry Options: Alkaline vs. Silver Oxide

Here’s where it gets interesting. While LR44 and AG13 are typically alkaline cells, there are silver oxide equivalents (SR44, 357) that share the same dimensions.

• Alkaline (LR44, AG13, A76, etc.):

  • Voltage: 1.5 V

  • Affordable, widely available

  • Gradual voltage drop during discharge

  • Shorter lifespan

• Silver Oxide (SR44, 357):

  • Voltage: 1.55 V

  • More expensive

  • Stable voltage until nearly depleted

  • Longer-lasting and better for precision devices

So while LR44 and AG13 are the same, not all “44-sized” button cells are identical in performance.

Interchangeability in Devices

In most devices, LR44 and AG13 batteries can be swapped without issues because they are physically and electrically equivalent. Common devices include:

• Toys with lights and sounds

• Calculators

• Laser pointers

• Small flashlights

• Digital thermometers

If your device manual lists LR44 or AG13, either battery type will work.

However, in devices requiring stable voltage—such as watches, cameras, or medical instruments—manufacturers often recommend silver oxide (SR44/357) instead of alkaline LR44/AG13. Using alkaline versions in these devices may shorten battery life or affect accuracy.

Performance Differences Between Brands

Even though LR44 and AG13 are technically the same, real-world performance can vary based on manufacturer quality. Higher-quality brands provide:

• Longer lifespan

• Better leakage resistance

• Consistent voltage output

Cheaper versions may discharge quickly or leak, which can damage devices. When replacing LR44 or AG13 batteries, it’s best to stick with trusted brands.

Misconceptions About LR44 vs. AG13

• Misconception 1: They are different sizes.

  • Reality: Both measure 11.6 mm × 5.4 mm.

• Misconception 2: They cannot be interchanged.

  • Reality: They are interchangeable in most devices.

• Misconception 3: AG13 is rechargeable while LR44 is not.

  • Reality: Both are non-rechargeable alkaline cells. Rechargeable lookalikes exist, but they are lithium-ion cells at 3 V, which are not substitutes.

Shelf Life and Storage

Both LR44 and AG13 batteries typically have a shelf life of 3–5 years when stored properly:

• Store in a cool, dry place.

• Keep in original packaging until use.

• Avoid heat and humidity, which shorten lifespan.

Safety Considerations

Because LR44 and AG13 are widely used in toys, they present safety concerns:

• Ingestion Risks: Small button cells can be swallowed by children and pose serious medical hazards.

• Leakage Risks: Poor-quality batteries may leak and damage devices.

• Mixing Batteries: Never mix old and new LR44/AG13 batteries in the same device.

Following safety guidelines ensures reliable use and minimizes risks.

Final Thoughts

So, are LR44 and AG13 batteries the same?

The answer is yes—they are physically identical alkaline button cells with the same dimensions and voltage. The only difference lies in the naming system: LR44 battery is the IEC standard, while AG13 is a common manufacturer code.

For everyday devices like toys, calculators, and small gadgets, LR44 and AG13 are interchangeable. The only distinction worth noting is when silver oxide versions (SR44, 357) are recommended for longer-lasting, stable performance in precision equipment.

By understanding these naming conventions and equivalents, you can replace batteries with confidence and avoid unnecessary confusion at the store.