AG1, also known as LR621 button battery, is available in alkaline and silver oxide versions. This article will introduce the equivalence, specifications, and applications of AG1 batteries, and compare AG1 with AG4.
Catalog
Overview of AG1 battery
AG1 & LR621 battery Specifications
AG1 Battery Application
AG1 Battery Equivalents
Difference Between AG1 and AG4 Battery
Overview of AG1 battery
The AG1 battery is another name for the LR621 battery, which is a small coin cell battery. Available in both alkaline and silver oxide versions. Silver oxide versions (often denoted as SR621SW) typically provide a more stable voltage and longer lifespan compared to the alkaline versions (denoted as LR621 or AG1).
The AG1 battery has a diameter of 6.8 mm and a height of 2.1 mm. LR44 batteries are typically 1.5 volts and have an operating temperature range of 0°C - 60°C, with an optimal temperature of 20°C. Because of its small size and reliability, the AG1 battery is commonly used in watches, small electronic devices like calculators, laser pointers, toys, and some medical devices.
AG1 & LR621 battery Specifications
Chemistry: Alkaline or Silver Oxide (SR621SW for the silver oxide version)
Voltage: Typically 1.5 volts for alkaline, 1.55 volts for silver oxide
Diameter: Approximately 6.8 mm
Height: Approximately 2.1 mm
Approximate weight: 0.28g
End point voltage: 0.9V
Storage humidity: 60±15%RH (no condensate)
Capacity: 9mAh, alkaline versions usually have a lower capacity compared to silver oxide versions, with the exact capacity depending on the manufacturer and the battery's application. Silver oxide versions (SR621SW) typically offer higher capacity and more stable voltage output, making them preferred for devices like watches that require consistent power over time.
Applications: Primarily used in small electronic devices that require a compact power source. This includes watches, small calculators, hearing aids, laser pointers, and some types of medical devices like digital thermometers.
Compatibility and Equivalents: The AG1 battery is equivalent to other battery codes depending on its chemistry, including LR60, 164, LR621 for alkaline versions, and 364, SR621SW for silver oxide versions.
AG1 Battery Application
Watch
Calculator
Electronic toy
laser pointers
small flashlights
medical equipment
For devices requiring intermittent bursts of power, such as toys or basic calculators, the alkaline version of the AG1 battery, the LR621, is preferred due to its capacity to deliver short, high-energy outputs. Conversely, the silver oxide version, the SR621SW, is tailored for applications demanding a steady and prolonged power supply. This variant is particularly favored in precision instruments and critical medical devices, where consistent voltage and durability are paramount.
AG1 Battery Equivalents
LR44 is an alkaline 1.5 V battery. The most common LR44 battery equivalent batteries are:
LR60
080-D29
G1A
L621
LR620
LR621
LR621W
Silver Oxide Equivalent Batteries
The AG1 can also be replaced with a silver oxide battery. The most common silver oxide equivalents are: 164, 364/363, CX60, D364, E364, GP364, S621E, SA621SW, SB-DG, SB-AG, SG1, SP364, SR60, SR60L, SR620SW, SR621(muRata SR621), SR621SW, SR621W(Maxell SR621SW, Seiko SR621SW), V364, V531, W1V, 364A and 364B.
To summarize, a comparison of AG1 battery equivalents and replacements are given in the following chemistries cross reference chart:
| Battery | Chemistry | Nominal and Cutoff Voltages | Capacity | Operating Temperature | Annual Self-Discharge Rate | Datasheet |
|---|
| Duracell D364 | Zinc/Monovalent Silver Oxide, low drain (Zn/Ag2 0) | 1.55V, 1.2V | 20 mAh, Discharge over 68.1 kΩ at 20°C to 1.2V | 0°C - 60°C | Less than 10% per year at 20°C | D364 Datasheet |
| Energizer 364/363 | Silver Oxide (Zn/Ag2O) | 1.55V, 1.2V | 68K ohm continuous drain at 21°C | - | Less than 2% per year at 20°C | 364/363 Datasheet |
| Maxell SR621SW | Silver Oxide | 1.55V, 1.2V | 18 mAh 47kΩ down to 1.2V @20°C | -10°C to +60°C | - | - |
| muRata SR621 | Silver Oxide | 1.55V, 1.2V | 20 mAh 47kΩ down to 1.2V @23°C | -10°C to +60°C | - | muRata SR621 Datasheet |
| Seiko SR621SW | Silver Oxide | 1.55V, 1.2V | 23 mAh 30kΩ down to 1.2V @23°C | -10°C to +60°C | - | SR621SW |
| Varta V 364 MF | Silver oxide/ Zinc / NaOH - Electrolyte | 1.55V, 1.2V | 17 mAh 68kΩ down to 1.2V @20°C | 0°C to +65°C | Less than 10% per year at 20°C | 364 MF Datasheet |
Difference Between AG1 and AG4 Battery
Overview of AG4 Battery
AG4(LR626) Battery
The AG4 battery, available in both alkaline (LR626) and silver oxide (SR626SW) chemistries, is a compact button cell battery with a nominal voltage of 1.5 volts and is known for its versatility in powering a wide range of small electronic devices. With dimensions typically around 6.8 mm in diameter and 2.6 mm in height, it is slightly larger than the AG1 battery, making it suitable for devices that require a balance between physical size and battery longevity. The silver oxide version, SR626SW, is particularly valued for its higher capacity and stable voltage output, ensuring longer device operation times and consistent performance, making it an optimal choice for watches, small toys, some medical devices, and other portable electronics that demand reliable and compact power sources.
AG4 Battery Feature
Chemistry: AG4 batteries can be found in both alkaline and silver oxide versions. The silver oxide version is often denoted as SR626SW.
Voltage: Like the AG1, AG4 batteries typically have a voltage of 1.5 volts for alkaline and 1.55 volts for silver oxide versions.
Diameter: Approximately 6.8 mm, similar to the AG1, but the height and capacity often differ.
Height: Approximately 2.6 mm, which is slightly thicker than the AG1 battery, allowing for a potentially larger capacity within the same diameter.
Capacity: The capacity of AG4 batteries varies depending on the chemistry and the manufacturer. Silver oxide versions generally offer higher capacity and a more stable voltage output, which is crucial for devices that require precise timing or long-term reliability, such as watches.
Applications: AG4 batteries are used in devices that may require slightly more power or longer life than those that use AG1 batteries. Common applications include watches, some calculators, small electronic toys, and also in some medical devices where a slightly larger battery is acceptable.
Compatibility and Equivalents: The AG4 battery is equivalent to other battery codes, including LR626, 177, 376, 377 for alkaline versions, and SR626SW for the silver oxide version.
AG1 vs AG4 Battery: Chemistry
AG1: Typically available in alkaline or silver oxide chemistries. The alkaline version is known as LR621, and the silver oxide version is referred to as SR621SW.
AG4: Also available in both alkaline and silver oxide versions, with the alkaline version commonly referred to as LR626 and the silver oxide version as SR626SW.
AG1 vs AG4 Battery: Voltage
AG1: Both the alkaline (LR621) and silver oxide (SR621SW) versions typically have a nominal voltage of 1.5 volts.
AG4: Similar to AG1, both the alkaline (LR626) and silver oxide (SR626SW) versions have a nominal voltage of 1.5 volts.
AG1 vs AG4 Battery: Capacity
AG1: The capacity of AG1 batteries can vary depending on the chemistry and the manufacturer, but the silver oxide version generally offers a higher capacity than the alkaline version.
AG4: AG4 batteries, particularly the silver oxide versions, tend to have a higher capacity compared to AG1 batteries, providing longer life for devices that require a steady power supply.
AG1 vs AG4 Battery: Size
AG1: Has a diameter of about 6.8 mm and a height of 2.1 mm.
AG4: Slightly larger, with a diameter of about 6.8 mm and a height of 2.6 mm.
AG1 Battery Size
AG4 Battery Size
AG1 vs AG4 Battery: Selection Criteria
The choice between AG1 and AG4 batteries largely depends on the specific requirements of the device, including its power consumption, size constraints, and expected life span. Devices designed for an AG1 battery may not accommodate an AG4 battery due to the slight difference in size, and vice versa.
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Frequently Asked Questions
1. Is an AG1 battery the same as a 364?
364 watch batteries, also known as SR621SW and SR60 batteries, are the silver oxide version of the AG1 button battery. The size is the same as the AG1 button battery, 6.8mm*2.1mm.
2. What battery is equivalent to AG1?
Alkaline equivalents of AG1 batteries include LR60, 080-D29, G1A, L621, LR620, LR621 and LR621W batteries, etc.
The equivalent silver oxide batteries for AG1 batteries include SP364, SR60, SR60L, SR620SW, SR621, SR621SW, SR621W and 364/363 batteries, etc.
3. Which watch battery is smaller than AG1 battery?
A watch battery smaller than the AG1 battery is the AG0 battery. They are the same thickness but the AG1 battery has a diameter of 6.8 and the AG0 battery has a diameter of 5.8mm.
4. Are AG1 and AG4 batteries the same?
No, the diameter of the AG1 and AG2 batteries are exactly the same, 6.8mm, but the AG4 is 2.6mm thick and the AG1 is 2.1mm thick. The higher thickness means that AG4 has a higher battery capacity, usually about 40% to 50% more mAh than AG1. The battery capacity varies between different manufacturers.