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Button cell batteries like AG1, 364, LR621, and SR621SW are widely used in small electronic devices such as watches, calculators, and thermometers.
Although these batteries often look similar and can sometimes be interchanged, they are not exactly identical.
The main difference lies in their naming systems and battery chemistry. For example, AG1 and LR621 usually refer to alkaline batteries; 364 and SR621SW are typically silver oxide batteries.
Therefore, it’s important to understand how these batteries compare and when they can be used interchangeably.
This guide will help you learn their key specifications, compatibility, and how to choose the right replacement for your device.
When comparing AG1, 364, LR621, and SR621SW batteries, it’s important to consider the name and other factors.
Key specifications like chemistry, voltage, capacity, size, and typical uses all affect how a battery performs in your device.
Battery chemistry determines its voltage stability and lifespan. Alkaline (AG1 / LR621) are more affordable but has a shorter lifespan and less stable voltage output.
Silver Oxide (364 / SR621SW) provides more consistent voltage and longer service life, making it ideal for precision devices.
The nominal voltage indicates the standard electrical output a battery provides during operation.
While alkaline and silver oxide batteries in this category have similar nominal voltages, typically 1.5V for AG1/LR621 and 1.55V for 364/SR621SW, the key difference lies in voltage stability.
Silver oxide batteries maintain a more consistent voltage throughout their lifespan, making them a better choice for precision devices like watches and sensitive electronics.
Capacity, measured in milliampere-hours (mAh), indicates how much energy a battery can store and how long it can power a device before replacement.
Silver oxide batteries (364 / SR621SW) typically offer a higher capacity of around 20–25 mAh, allowing for longer and more stable operation.
In contrast, alkaline batteries (AG1 / LR621) usually have a lower capacity of about 15–18 mAh, meaning they tend to drain faster, especially in continuous-use devices.
All four batteries share the same physical size: approximately 6.8 mm in diameter and 2.1 mm in height.
This uniformity allows them to fit into the same battery compartments, making replacement straightforward.
However, while the size is identical, actual compatibility also depends on factors like battery chemistry and performance characteristics.
-Understanding the key specifications of 364, AG1, LR621, and SR621SW batteries helps you quickly identify their differences and choose the right replacement.
-Although these batteries share the same size, their chemistry and performance vary.
| Battery Model | 364 | AG1 |
|---|---|---|
| Image | |
|
| Chemistry | Silver Oxide | Alkaline |
| Nominal Voltage | 1.55V | 1.5V |
| Capacity | 20-25 mAh | 15-18 mAh |
| Diameter | 6.8 mm | 6.8 mm |
| Height | 2.1 mm | 2.1 mm |
| Battery Model | LR621 | SR621SW |
|---|---|---|
| Image | |
|
| Chemistry | Alkaline | Silver Oxide |
| Nominal Voltage | 1.5V | 1.55V |
| Capacity | 15-18 mAh | 20-25 mAh |
| Diameter | 6.8 mm | 6.8 mm |
| Height | 2.1 mm | 2.1 mm |
These specifications an help you quickly understand the performance comparison of each battery and when to use the same battery as a replacement.
Although 364, AG1, LR621, and SR621SW batteries share the same size, their compatibility depends on physical fit and performance characteristics such as voltage stability and capacity.
The 364 and SR621SW batteries are fully compatible. Both are silver oxide batteries with the same nominal voltage (1.55V), similar capacity, and identical dimensions.
This makes them directly interchangeable in most devices, especially in precision electronics like watches that require high voltage stability.
The AG1 and LR621 batteries are fully compatible. They are both alkaline batteries with a nominal voltage of 1.5V and similar capacity.
Because they share the same chemistry and size, they are interchangeable in low-drain devices such as small toys, calculators, and basic electronic gadgets.
While all four batteries are the same size and can physically fit into the same compartment, cross-compatibility between silver oxide (364/SR621SW) and alkaline (AG1/LR621) batteries requires caution.
Possible substitution: In many low-drain devices, you can replace an alkaline battery with a silver oxide for longer life and better performance.
Performance differences: Silver oxide batteries provide a more stable voltage, while alkaline batteries gradually lose voltage during use.
Sensitive devices: For precision devices like watches, it is recommended to use 364 or SR621SW instead of alkaline equivalents to ensure accurate and consistent operation.
While these batteries are often interchangeable in terms of size, choosing the right chemistry ensures optimal performance and reliability.
Different manufacturers use varying naming systems, the same battery may be sold under multiple model numbers. Knowing these equivalents helps you find the right replacement easily.
The 364 and SR621SW are silver oxide batteries and are widely cross-referenced with several equivalent models, including:
SR60
SR621
V364
D364
SB-AG
These batteries are known for their stable voltage and longer lifespan, making them ideal for watches and other precision devices.
The AG1 and LR621 are alkaline batteries and also have multiple equivalent designations, such as:
LR60
L621
G1A
GP364 (alkaline version)
These equivalents are typically more affordable and suitable for low-drain devices, but they may not last as long as silver oxide alternatives.
Understanding these common model numbers ensures you can quickly identify compatible replacements, even if the labeling differs between brands.
-Temperature has a direct impact on the performance of AG1, 364, LR621 and SR621SW batteries.
-Both alkaline and silver oxide chemistries respond differently to heat and cold, which can affect runtime, voltage stability, and overall reliability.
Temperature also plays a key role in storage life. Both battery types should store in a cool, dry place, ideally at room temperature.
Excess heat can shorten shelf life, while low temperatures can temporarily reduce performance once the battery is installed.
Proper storage helps maintain capacity and ensures the battery is readily available when needed.
| Battery Type | Temperature Sensitivity | Storage Best Practices |
|---|---|---|
| Alkaline (AG1, LR621) |
- Susceptible to efficiency loss in cold - potential leakage in high heat |
- Store in cool, dry places - avoid extreme cold and heat; check for corrosion regularly |
| Silver Oxide (364, SR621SW) | Maintains performance across a wide temperature range |
- Store in cool, dry places - maintain in original packaging or use a battery organizer |
Battery Type, Temperature Sensitivity, and Storage Best Practices
To ensure proper performance and device safety, selecting the correct replacement for AG1, 364, LR621, or SR621SW batteries depends on several key factors.
All these batteries share the same dimensions (6.8 mm × 2.1 mm), so they will fit the same compartment. However, physical fit alone does not guarantee proper performance.
Choosing a silver oxide equivalent (364 or SR621SW) is usually the safer option, especially for devices requiring high precision and reliability.
Proper handling of AG1, 364, LR621, and SR621SW batteries helps ensure safe operation, longer device life, and reliable performance.
Always handle button cell batteries carefully and avoid touching both terminals at the same time. Because this may cause a short circuit or reduce battery life.
Make sure the positive (+) and negative (–) sides are correctly aligned before inserting the battery into the device. Incorrect installation prevent the device from working or cause damage.
Avoid mixing alkaline (AG1 / LR621) and silver oxide (364 / SR621SW) batteries in the same device. Different chemistries discharge at different rate and lead to poor performance or leakage.
If a device uses more than one button cell, replace all batteries at the same time to maintain consistent power output and avoid uneven discharge.
Keep spare batteries in a cool, dry place, away from direct sunlight and moisture. Proper storage helps preserve shelf life and prevents premature discharge.
Do not carry loose batteries in pockets or bags with metal objects like coins or keys. Physical contact with metal can cause short circuits.
Used batteries should be disposed of according to local regulations or recycled at designated battery collection points. Do not throw them in regular household waste.
Following these simple safety tips ensures reliable performance and reduces the risk of damage to both the battery and your device.
Understanding the differences between AG1, 364, LR621, and SR621SW batteries is essential for choosing the right replacement and ensuring optimal device performance.
Although these batteries share the same physical size, they differ in chemistry, voltage stability, and capacity, which directly affects their battery life and reliability.
Silver oxide batteries (364 / SR621SW) are the better choice for precision devices such as watches due to their stable voltage and longer lifespan.
Alkaline batteries (AG1 / LR621), on the other hand, are more cost-effective and suitable for low-drain electronics with lower performance requirements.
Considering key factors such as compatibility, temperature effects, and proper handling, you can avoid common replacement mistakes and extend the life of the battery and the device.
Choosing the correct equivalent ultimately ensures safer use, better efficiency, and more reliable operation.
Yes. Duracell 364 and SR621SW are 1.55V silver-oxide button cells with same sizes (about 6.8 mm diameter x 2.1 mm height). They are fully interchangeable in watches and calculators.
No. SR621SW and AG1 differ in their chemistry: SR621SW is a silver oxide battery (long-lasting) while AG1 is an alkaline battery (shorter lifespan).
No. LR621 and SR621SW differ in chemistry: SR621SW is a silver-oxide battery (1.55V) designed for high-drain/long-life in watches; LR621 is an alkaline battery (1.5V) suited for low-drain, less precise devices.
364 and an AG1 battery differ in chemistry: the 364 (1.55V) is a silver oxide battery (lasting longer, higher cost), while the AG1 (1.5V) is an alkaline battery (cheaper, lower capacity).
The best replacements for an SR621SW (1.55V silver oxide) battery are the 364, SR60, or V364. Other common alternatives include SB-AG/DG, 280-34, and AG1 or LR621 (alkaline).
The most common and direct alternative to the 364 battery (1.55V silver oxide, 6.8 × 2.1 mm) is the SR621SW battery. Other direct equivalents include AG1, LR621, 363, SR60, and V364.
"LR" on a battery stands for Alkaline (L) and Round/Cylindrical (R) shape. It indicates a 1.5-volt alkaline battery, commonly used for low-drain devices like toys, calculators, and remotes.
A 364 battery is a 1.55V silver oxide button cell used in analog watches, calculators, digital thermometers, and medical devices. It is also used in toys and keyless entry remotes.
Yes. The 364/363 designation is the universal equivalent for SR621SW. They are 1.55V silver oxide button cells with identical 6.8 x 2.1 mm dimensions and are fully interchangeable for watches and small electronics.
The AG1 battery (1.5V alkaline) is a small button cell commonly replaced by equivalents like 364, LR621, LR60, SR621SW, and 164.
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