What is SR621SW?

Application Scenarios of SR621SW

Alternatives to SR621SW

Brands of SR621SW

Installation and Replacement Tips

How to Dispose of Used SR621SW Batteries

Frequently Asked Questions

Basic Definition

SR621SW is a widely used small button battery. It belongs to the silver oxide battery (Silver Oxide Battery) family. It is known for its stable voltage output and long service life. This battery plays an important role in many small electronic devices and brings convenience to modern life.

Size and Design

Standard size: Diameter is usually 6.8 mm, height is about 2.1 mm

Appearance design: Typical button battery shape with a metal shell

Polarity mark: The front with a “+” mark is the positive electrode (Anode), and the flat back is the negative electrode (Cathode)

This compact design makes it easy to install in many small devices. Its small size and reliable performance form a good balance to meet space and energy needs.

Battery Specifications

Chemical composition: Silver oxide

Nominal voltage: 1.55 volts

Capacity: Usually between 12-16 milliampere-hours (mAh), depending on the manufacturer

Operating temperature range: Usually from 0°C to 60°C

Data shows that SR621SW has better voltage stability than alkaline batteries. In continuous discharge tests, its voltage line remains stable, with fluctuations within ±0.05V.

Features

• High energy density: About 30% more energy per unit volume than normal batteries
• Stable discharge performance: Voltage stays stable during its life
• Long service life: Can last 2-3 years under normal use
• Good low-temperature performance: Keeps more than 85% performance at 0°C

Compared with normal alkaline batteries, SR621SW has higher energy density. Tests show it has 25-30% more energy in the same volume, which is important for devices that need long and stable power.

Consumer Electronics

SR621SW is widely used in consumer electronics, such as:

• Calculators: Provide stable power
• Electronic dictionaries: Support long learning time
• Small game consoles: Ensure smooth game experience

In these devices, battery stability affects user experience. User feedback shows that devices using high-quality SR621SW batteries have over 60% fewer shutdown accidents.

Portable Devices

Portable devices need higher battery performance:

• Electronic watches: Need accurate time power
• Car key remote controls: Must work reliably anytime
• Laser pointers: Need stable output power

In safety devices like car keys, SR621SW shows strong reliability. Test data shows its failure rate is below 0.1%, much lower than other batteries.

Medical Devices

SR621SW plays a key role in medical devices:

• Small medical devices like blood glucose meters: Need precise measurement power
• Hearing aids (some models): Provide clear sound amplification

Medical devices have high requirements for stability. Clinical data shows SR621SW has a 99.8% performance pass rate in key medical devices.

Other Uses

SR621SW is also used in:

• Electronic toys
• LED decoration lights
• Small electronic gifts

In these uses, self-discharge rate is important. SR621SW has a yearly self-discharge rate below 5%, so it keeps over 95% power after one year of storage.

Equivalent Models

SR621SW has some common equivalents:

• AG1: Similar performance
• 364: Model code used by some brands
• LR621: Alkaline version, voltage is slightly lower (1.5V)

Compatible Model Comparison

Data shows SR621SW has better capacity and service life. In continuous discharge tests, its voltage stability is 40% higher than LR621.

International Brands

• Energizer: USA brand, stable performance
• Duracell: Reliable quality
• Panasonic: Japan brand, advanced technology
• Maxell: Professional battery manufacturer
• Renata: Swiss brand, expert in watch batteries

Domestic Brands

• Tianqiu: High cost performance
• Bull: Stable quality
• Feishi: Reliable performance

Brand Selection Tips

Consider the following:

• Manufacturer’s recommended brand
• Price vs performance: International brands are stable but more expensive; domestic brands are cheaper
• Reliable buying channels

Market data shows international brands last about 30% longer but cost about 50% more.

Preparation

• Confirm battery model
• Prepare tools like tweezers and gloves
• Clean battery contacts

About 30% of failures are caused by wrong installation. Good preparation can reduce failure to below 5%.

Installation Steps

• Check polarity: Positive side (+) faces up
• Use dry tools to place the battery
• Make sure it is fixed well
• Close the battery cover

Safety Notes

• Avoid short circuit
• Keep away from high heat
• Install with correct polarity

Correct installation extends life by about 25% and reduces short circuit risk by 90%.

Common Problems

• Battery not working: Check polarity
• Device still not working: Clean contacts
• Battery heats up: Remove and check device

Environmental Harm

• Contains heavy metal components
• May pollute soil and water
• Can take decades to break down

One button battery may pollute 600,000 liters of water, equal to one person’s lifetime drinking water.

Proper Disposal

• Collect separately
• Send to battery recycling points
• Use community hazardous waste collection

In many cities, recycled batteries have a metal reuse rate of over 95%.

Forbidden Actions

• Do not throw away randomly
• Do not put in general trash
• Do not burn to avoid toxic gas

Recycling Value

• Recovered metals save natural resources
• Reduces waste
• Supports sustainable development

About 200 kg of metal can be recovered from one ton of used batteries for industrial use.

What battery is equivalent to SR621SW?

Batteries such as the AG1, 364, LR621, and LR60 serve as suitable replacements for the SR621SW. They are completely interchangeable in the majority of applications, thanks to their shared specifications: 6.8mm diameter, 2.1mm thickness, and 1.55V voltage.

Is Duracell 364 the same as SR621SW?​

Yes, the Duracell 364 is equivalent to the SR621SW. "SR621SW" is the standard nomenclature for this type of silver oxide button cell, while "364" is one of its industry-recognized alternative codes. Both refer to a battery with identical physical dimensions (6.8mm x 2.1mm) and electrical output (1.55V).

Can I use SR621SW instead of SR626SW?

The SR621SW and SR626SW are distinct batteries and are not interchangeable. It is strongly advised against using an SR621SW for an SR626SW, as the mismatch can lead to poor connection, unreliable performance, or harm to your device. Always use the correct battery type.

What is the difference between W and SW battery?

According to the IEC standard battery naming system, the primary distinctions between W and SW batteries lie in their chemical composition, voltage, capacity, and intended use. Batteries designated with a "W" suffix are the standard, low-drain versions for watches, whereas those ending in "SW" indicate a high-drain variant.