AG1 Battery Guide - Technical Specifications, Applications, Equivalent Cells and Comparison to AG4

The AG1 battery, widely known as the LR621, is a ubiquitous small coin cell battery on the market. It has a sophisticated design and is tailor-made for various portable electronic devices. The two main chemical versions of this battery—alkaline and silver oxide—each have their unique advantages, with the silver oxide version (commonly labeled SR621SW) providing more stable voltage and longer life over its lifetime. And much favored. The AG1 battery is small in size, with a diameter of only 6.8 mm and a height of 2.1 mm. It can still work stably under extreme temperature conditions (from -30°C to +60°C), and its ideal operating temperature is 20°C.

The AG1 battery, commonly known as LR621, is a small coin cell battery widely used in a variety of portable electronic devices. AG1 batteries are known for their compact, efficient design and come in two main chemistries: alkaline and silver oxide. The silver oxide variant, often labeled SR621SW, is particularly valued for its ability to maintain a stable voltage throughout its service life and for longer durability. The AG1 battery is only 6.8mm in diameter and 2.1mm tall, making it perfect for tight spaces within devices. It operates effectively over a wide temperature range from as low as -30°C to as high as +60°C. However, it performs best at moderate temperatures around 20°C.

• • Chemical composition: There are two types: alkaline and silver oxide. The silver oxide version is identified as SR621SW.
• • Voltage: Alkaline cells provide a standard voltage of 1.5 volts, and silver oxide cells have a slightly higher voltage of 1.55 volts.
• • Diameter: approx. 6.8 mm.
• • Height: approx. 2.1 mm.
• • Approximate weight: approx. 0.28 g.
• • End voltage: Operating voltage as low as 0.9 volts before the battery is exhausted.
• • Storage humidity: 60±15%RH (no condensation, ensuring long-term efficiency)
• • Capacity: Alkaline versions are usually around 9mAh. Capacities may vary slightly depending on the manufacturer and the battery's specific application. The silver oxide version has higher capacity and stable voltage output, making it ideal for devices such as watches that require stable and long-term power supply.
• • Compatibility and equivalency: Alkaline version equivalent batteries are LR60, 164, LR621. Silver oxide equivalents are 364 and SR621SW.

• • watch
• • calculator
• • electronic toy
• • Laser pointer
• • Small flashlight
• • Medical equipment, such as maintaining reliable power for critical health monitoring tools.

In terms of applications, application fields are usually divided according to component versions. The alkaline version of AG1, usually labeled LR621, is particularly suitable for devices that require intermittent high-energy output because it can quickly provide high peak current. In contrast, the silver-oxide version of the AG1, commonly identified as SR621SW, is designed for use in precision equipment that requires long-term and stable power.

Primary AG1 Alkaline Model: LR621, a 1.5V battery.

Common Alkaline Substitutes: These are batteries that you can use in place of an LR621 if it's not available:

• • LR60
• • 080-D29
• • G1A
• • L621
• • LR620
• • LR621W

Silver Oxide Options: For devices that require a more stable and long-lasting power source, silver oxide batteries can replace the AG1 alkaline versions.

List of Silver Oxide Substitutes:

• • 164, 364/363, CX60, D364, E364, GP364
• • S621E, SA621SW, SB-DG, SB-AG, SG1, SP364
• • SR60, SR60L, SR620SW, SR621 (including muRata SR621)
• • SR621SW, SR621W (including Maxell SR621SW, Seiko SR621SW)
• • V364, V531, W1V, 364A, 364B

• • Long Shelf Life: If stored under optimal conditions, AG1 batteries can last for more than five years. This means the battery is replaced less frequently and performs reliably at the end of its life.
• • Wide operating temperature range: Effective operation between -30°C to +60°C. Ideal for use in a variety of climates, from freezing temperatures to scorching heat, without compromising performance.
• • Stable voltage output: Provides stable voltage throughout its service life. Make sure devices like watches and calculators work smoothly and accurately without unexpected shutdowns or power issues.
• • Leak-Proof Design: Minimizes the risk of damaging leaks. Protect sensitive electronic components in equipment and extend their service life.

• • Higher Cost: Typically more expensive than some other alkaline batteries on the market. Users may weigh costs against advantages such as longevity and stability before purchasing.
• • Lower Capacity: Lower energy capacity compared to larger batteries. May not be suitable for power-hungry devices or devices that require long periods of uninterrupted use.

Available in alkaline (LR626) and silver oxide (SR626SW) versions, the AG4 battery is a versatile coin cell battery. It has a diameter of about 6.8 mm and a height of about 2.6 mm, which is slightly larger than the AG1. This size gives the AG4 a balance between a compact design and extended battery life. The oxidized silver model SR626SW is particularly popular for its higher capacity and stable voltage output, making it ideal for powering devices such as watches, small toys, and some medical devices that require reliability and compact, long-lasting power.

• • Chemical Composition: Available in alkaline or silver oxide versions, the silver oxide version is usually labeled SR626SW.
• • Voltage: Both versions typically offer 1.5 volts, similar to the AG1, with silver oxide sometimes offering up to 1.55 volts for enhanced performance.
• • Physical Dimensions: Same 6.8mm diameter as AG1, but 2.6mm taller for greater capacity.
• • Capacity: Varies by type and manufacturer. Silver oxide versions generally offer higher capacities.
• • Applications: For use in devices that may require more power or longer life than devices using AG1, such as certain calculators, toys, and medical equipment.
• • Compatibility & Equivalency: AG4 matches other battery models including alkaline LR626, 177, 376, 377 and silver oxide SR626SW.

• • Chemical Composition: Both batteries are alkaline and silver oxide. The basic AG1 is called LR621 and its AG4 counterpart is called LR626. Their silver oxide versions are SR621SW and SR626SW respectively.
• • Voltage: Both battery types provide a nominal voltage of 1.5 volts through different chemistries.
• • Capacity: While capacities vary, AG4 batteries (especially the silver oxide form) generally offer higher capacity than AG1, supporting longer device use.
• • Size: Both have the same diameter, 6.8mm. The AG4 is taller at 2.6mm than the AG1's 2.1mm, allowing for greater capacity.
• • Selection Criteria: The choice between AG1 and AG4 often depends on device requirements, including power needs, space constraints, and expected battery life. Slight size differences may affect compatibility with some devices.

Whether in watches, calculators, medical equipment, or other small electronic toys and tools that require reliable power, AG1 batteries have become an essential electronic component due to their outstanding performance characteristics and adaptability. The choice between AG1 or AG4 batteries, or any other battery type, must take into account the specific needs of the device, space constraints, and expected lifespan. When operating and replacing batteries, it is equally important to properly identify and dispose of old batteries. Therefore, rational selection and use of batteries can not only optimize device performance but also extend the service life of the device, thereby achieving a win-win situation between technology and environmental protection.

AG1 batteries are small coin cells commonly used in watches and tiny electronic devices. Choosing Compatible Batteries You may also consider the LR621 or SR621SW batteries as alternatives. Both types match the AG1 in voltage and shape. They are interchangeable with the AG1 and provide reliable power to keep your equipment running smoothly.

Yes, AG1 and 364 batteries are basically the same. Their dimensions (6.8mm diameter and 2.1mm height) and voltage (1.5 volts) are consistent and can often be used interchangeably.

Like the AG1, it measures the same and provides the same voltage. However, SR621SW contains silver oxide, which results in more stable performance and longer life.

Difference Between LR and AG Batteries The main difference between LR and AG batteries is their chemical composition. LR batteries are alkaline batteries while AG batteries are made of silver oxide. Although they may be similar in size, this difference affects their voltage stability and lifespan.

What “AG” Means in Battery Terminology In battery terminology, “AG” stands for Argentum, the Latin word for silver. AG batteries generally refer to batteries that use silver oxide as the positive electrode material.