4SR44, 4LR44, PX28A, A544, 28A, K28A Battery Equivalents and Replacements

4SR44 or 4LR44 battery is a small cylindrical battery often used in dog collars, film cameras, small LED flashlights, car security systems, remote controls, toys, and similar.

Common labels for this battery are 4SR44 or 4LR44, depending on the exact chemistry, but there are many other labels that may confuse the user, including PX28A, A544, 28A, K28A, K28L, V34PX, 476A, 4A76, 2CR1/3N, 2CR11108, etc.

Updated: November 27, 2024.

4LR44, 4SR44, A544, PX28L Batteries Features and Specifications

Physical dimensions of the 4LR44/4SR44 batteries are 25.2 mm in height and 13 mm in diameter (~0.992 x 0.518 inches), with their labels (4LR44 or 4SR44) describing their internal construction - four LR44 or SR44 batteries stacked vertically.

Thus, some manufacturers even deliver their devices powered by 4SR44 or 4LR44 batteries with the small plastic battery holder, allowing the use of single 4LR44/4SR44 batteries, or four LR44/SR44 batteries, or even two CR11108 (CR1/3N, 2L76, 2LR44) batteries.

Note: four LR44/SR44 or two CR11108 or CR1/3N batteries stacked vertically feature a diameter of 11.6 mm and a height of 21.6 mm, thus requiring a battery holder to fit a 25.2x13 mm battery compartment.

The typical capacity of the 4LR44 alkaline battery is 130-170 mAh, and around 150-200 mAh for the 4SR44 battery, with the most important features given in the following chart:

Typical labels of these 25.3x13 mm non-rechargeable batteries are 4SR44, 4LR44, PX28A, A544, K28A, K28L, V34PX, 28A, 476A, 4A76, 2CR1/3N, 2CR11108, but believe or not, there are other labels as well.

Generally, 4LR44 is an alkaline battery, 4SR44 is a silver-oxide battery, while 2CR1/3N or 2CR11108 are typically non-rechargeable lithium batteries.

Also, some manufacturers offer lithium 13 x 25.2 mm batteries, often labeled as PX28L or 2CR1/3N, featuring two Lithium Manganese Dioxide batteries connected in series for a nominal voltage of 6.0V - a typical example is Duracell PX28L (2CR1/3N) battery.

Fortunately, to sell their batteries, manufacturers write down several labels, often their in-house label, and the battery's chemistry.

The capacity and cutoff voltage of 4LR44/4SR44 batteries depend on the drain current and the device being powered by these batteries.

For example, Energizer A544 battery is an alkaline battery consisting of four LR44 batteries connected in series, featuring a metal jacket.

Their typical capacity is 178 mAh when being discharged over 30kΩ at 21°C down to 3.6 volts.

While 178 mAh is an excellent capacity for an LR44 or 4LR44 battery, not every electronic device can operate with such low input voltage (most do, but if not sure, check the documentation, and if the cutoff voltage of your device is 4.0 or more volts, expect somewhat lower actual capacity.

Varta V28PX battery is a high-drain silver-oxide 4SR44 battery with a nominal voltage of 6.2 volts and a typical capacity of 145 mAh when discharged using a 20kΩ load at 20°C down to 3.6 volts.

Despite being a silver-oxide battery, Varta V28PX features lower nominal capacity than alkaline Energizer A544 (145 vs. 178 mAh), but the drain current of the Varta V28PX is almost twice as strong as Energizer A544 current (310μA vs. 160 μA), despite being discharged using 33% lower resistance (20kΩ vs. 30 kΩ), thanks to the higher voltage and lower internal resistance of the high-drain silver-oxide batteries.

So, in this example, which one is better, alkaline Energizer A544 or silver-oxide Varta V28PX?

Obviously, if you have to choose between these two models, for low-drain devices, go for the Energizer A544, and for high-drain devices, go for the Varta V28PX battery.

Like all other similar batteries, 4LR44 and 4SR44 batteries feature, on average, a 3-5 years of shelf life, with some low-drain models used as motherboard batteries feature 5-7+ years of shelf life. Also, lithium 25.2 x 13 mm batteries (2CR1/3N) often have storage life of 10+ years.

4LR44, 4SR44, PX28L Batteries Comparison Chart

The following comparison chart lists some of the most popular cylindrical 6V 13.0 x 25.2 mm batteries:

Of course, there are many other models on the market.

As one can see, Lithium Manganese Dioxide (LiMnO₂) chemistry offers similar performances in terms of capacity.

However, such batteries are excellent for low-current and standby performances as well as high-drain pulse discharges.

When compared with alkaline and silver-oxide batteries, which have 4 (four) batteries connected in series, lithium batteries feature 2 (two) batteries connected in series.

4LR44/4SR44 Battery Safety Issues

Although 4LR44/4SR44 batteries are not the smallest batteries on the market, kids and pets may try to swallow them.

If that happens, call immediately local emergency services and do as you are told - modern 4LR44/4SR44 batteries don't contain mercury, cadmium, or similar heavy metal, but when swallowed, they start electrolytic processes in human/animal body that can be rather dangerous and can cause chemical burns.

Long Story Short: When looking for a 4LR44/4SR44/PX28L/A544 battery equivalent or replacement, go for a 4LR44/4SR44 battery from a reputable brand and go for the most popular models with good reviews.

4LR44/4SR44 are rather common batteries, they are manufactured by most battery brands and are available around the world in various hardware stores and online shops.

Some of the most popular 4LR44 and 4SR44 models include (Amazon links, the links open in the new windows):

• PetStandard 4LR44 6V Battery
• Energizer 4LR44 A544 6V Battery
• GoodBoy 4LR44 6V Battery
• Panasonic 4SR44 6.2V Battery

4SR44 batteries usually cost more than 4LR44 batteries, but they are more energy-dense batteries, offering more stable output voltage. Nonetheless, 4LR44 batteries are still more popular.

How to Prolong the Lifetime of 4LR44, 4SR44, and 2CR1/3N Batteries?

Extending the lifespan of batteries like 4LR44, 4SR44, and 2CR1/3N ensures better performance, reduces costs, and minimizes environmental waste. Here are key tips for maintaining and optimizing the life of these batteries:

Store Batteries Correctly

• Cool and Dry Environment: Keep batteries in a place free from extreme heat or humidity, as high temperatures can accelerate chemical degradation.
• Avoid Freezing: Storing batteries in very cold conditions can damage their internal structure. Aim for a stable temperature between 10°C and 25°C (50°F and 77°F).
• Keep Terminals Clean: Dirt or corrosion on terminals can cause inefficient energy transfer. Periodically clean them with a dry cloth.

Use Devices Efficiently

• Turn Off Devices When Not in Use: Powering down devices, such as remote controls, cameras, or pet collars, prevents unnecessary battery drain.
• Remove Batteries During Long Inactivity: If a device won't be used for an extended period, remove the batteries to avoid leakage or parasitic drain.

Match Batteries to Device Requirements

• Use the Correct Type: For example, silver oxide (4SR44) may perform better in high-drain devices, while alkaline (4LR44) suits low-drain devices. Lithium (2CR1/3N) batteries offer higher energy density and longer shelf life.
• Avoid Mixing Old and New Batteries: Mixing batteries with different charge levels can cause imbalances, reducing overall lifespan.

Avoid Deep Discharge

If you have rechargeable 25.2 x 13 mm batteries, do not let batteries fully discharge before recharging them, as this can harm their chemistry and reduce performance.

Use Quality Batteries

• Invest in reputable brands that offer consistent quality. Low-cost batteries may have shorter lifespans and a higher risk of leakage.

Minimize Exposure to Heat

Avoid placing battery-powered devices in direct sunlight or near heat sources, as excessive temperatures can degrade internal components and reduce battery life.

Monitor Battery Usage

Use devices with low-battery indicators or test the voltage periodically with a multimeter to ensure timely replacement, avoiding overuse that can lead to leakage.

Consider Rechargeable Alternatives

• If appropriate for your device, opt for rechargeable versions of these batteries to reduce long-term costs and environmental impact.

These steps can help maximize the life and efficiency of 4LR44, 4SR44, and 2CR1/3N batteries, ensuring reliable performance and minimizing waste.

4LR44, 4SR44, and 2CR1/3N Battery Disposal

Proper disposal and recycling of batteries like 4SR44, 4LR44, or 2CR1/3N are essential to protect the environment and comply with local regulations.

These batteries may contain harmful chemicals, including lithium, silver oxide, or alkaline substances, which require responsible handling.

Identify the Battery Type

Before disposal, check the specific type of battery (4SR44, 4LR44, or 2CR1/3N) and its chemistry:

• 4SR44: Silver oxide
• 4LR44: Alkaline
• 2CR1/3N: Lithium

The composition determines recycling options and potential environmental risks.

Check Local Regulations

Research local guidelines for battery recycling. Many regions prohibit throwing batteries in household trash due to potential environmental contamination.

Visit your municipality's website or contact their waste management department for specific rules.

Use Designated Collection Points

Take your used batteries to authorized collection points or recycling centers. These may include:

• Electronics retailers
• Hazardous waste facilities
• Battery recycling drop-off bins at supermarkets or hardware stores

Some manufacturers also offer mail-in recycling programs for their batteries.

Store Batteries Safely Before Recycling

Store used batteries in a cool, dry place, away from heat and moisture. Ensure terminals are covered with non-conductive tape to prevent short circuits during storage and transportation.

Avoid Improper Disposal

Do not burn, puncture, or incinerate these batteries, as this can release toxic substances or cause a fire. Avoid mixing them with general household waste.

Promote Sustainable Practices

Whenever possible, choose rechargeable alternatives to reduce waste and minimize the environmental impact of disposable batteries.

Properly disposing of and recycling 4SR44, 4LR44, and 2CR1/3N batteries contributes to environmental preservation and helps recover valuable materials for reuse. Always prioritize safe and responsible battery handling.