CR2 Battery Guide - Characterization, Equivalents, and Comparison to 15270 Batteries

CR2 batteries are small, non-rechargeable 3.0V lithium cells frequently employed in cameras, golf rangefinders, and various tactical equipment.

In contrast, 15270 (also known as 15266) batteries are rechargeable lithium cells with a nominal voltage ranging from 3.0 to 3.7 volts. Due to their similar dimensions, these rechargeable batteries are often labeled as "rechargeable CR2."

Despite the benefits of rechargeable options, users must consider the voltage differences and specific power requirements of their devices.

Catalog

Characteristics and Specifications of the CR2 Battery

The CR2 battery is a type of non-rechargeable lithium battery, characterized by a nominal voltage of 3.0 volts and a cutoff voltage of 2.0 volts. The battery measures 27 millimeters in height and 15.6 millimeters in diameter. Typically, it ranges from 800 to 850 mAh, but varies based on discharge conditions. Manufacturers often use different labels for these batteries, such as 1CR2 or DL-CR2. CR2 batteries can be made of either lithium manganese dioxide or lithium thionyl chloride. Depending on the brand, the shelf life varies from 3 to 10 years, making them a reliable choice for emergency devices.

But why do the chemical compositions matter? It's because these differences affect performance characteristics. For instance, lithium manganese dioxide batteries exhibit excellent stability, while lithium thionyl chloride batteries offer higher energy densities. This is critical information for choosing the right battery type based on specific application needs.

For example, photographers often favor CR2 batteries for their reliability and compact size in high-drain devices, such as flash units. This particular use case highlights the balance between battery performance and physical dimensions, which is crucial for portable devices.

Moreover, professionals in the health and safety industries rely on CR2 batteries for their high energy density and long shelf life. These traits are particularly valuable in emergency medical equipment, where battery failure can have severe consequences. The ability to maintain a charge over several years underscores the reliability needed in critical situations.

CR2 Battery Specifications and Performance

The CR2 battery operates with a nominal voltage of 3.0 volts and cuts off at 2.0 volts. It maintains a low self-discharge rate and functions within a temperature range from -40°C to +70°C. At room temperature, its performance peaks, delivering a steady current between 10-20 mA. This high discharge capacity makes it well-suited for high-drain devices like cameras and tactical flashlights. Interestingly, certain models can withstand 900-1000 cycles when pulsed at 900mA at room temperature.

All models in the chart feature a nominal voltage of 3.0 volts, a nominal cutoff voltage of 2.0 volts, and a very low self-discharge rate.

Also, the 'official' operating temperature is usually between -40°C to +70°C, but one must be aware that the performances of these batteries depend on the temperature, and they perform best at room temperatures (20-25°C) and temperatures outside of -10°C and 50°C should be avoided, if possible.

Battery Datasheet	Capacity	Operating Temperature	Discharge Currents
Duracell DLCR2	920 mAh, 100Ω down to 2.0V	-20°C to +75°C	20 mA std. cont. 60 mA max. cont.
EEMB CR2	850 mAh	-40°C to +85°C	10 mA std. cont. 800 mA max. cont. 1500 mA max. pulse
Energizer CR2	800 mAh, 100Ω @21°C down to 2.0V	-40°C to +60°C	1000 mA max. continuous 1200 mA, 3s/7s, @21°C, 760 cycles, down to 1.8V 1800 mA, 3s/7s, @21°C, 400 cycles, down to 1.8V 2500 mA max. pulse
GP CR2	800 mAh, @10 mA @23°C down to 1.8V	-40°C to +60°C	10 mA continuous 900 mA, 3s/27s, @23°C, 900 cycles, down to 1.6V
Panasonic CR2	850 mAh	-40°C to +70°C	20 mA continuous 900 mA, 3s/27s, @20°C, 1000 cycles, down to 1.8V
Varta CR2	850 mAh, @20mA @20°C down to 2.0V	-	20 mA continuous 900 mA, 3s/27s, @25°C, 900 cycles, down to 1.5V

In practice, the CR2 battery's versatility expands beyond lab boundaries.

• Professional photographers: Often count on these batteries for reliable power during lengthy shoots, especially in remote locations where swapping batteries is inconvenient. This reliance is crucial when the need for sustained energy is unyielding.
• Tactical community: Law enforcement and military personnel commonly use CR2 batteries in essential equipment like flashlights. The battery’s ability to function reliably across deserts and arctic climates underscores its value in demanding environments.

A question that often arises is, what makes the CR2 battery an excellent choice for emergency kits? The key lies in its low self-discharge and high discharge capabilities. This synergy ensures readiness even after long periods of inactivity, making it a wise selection for long-term storage.

CR2 vs. 15270 (15266) Batteries

Standard CR2 vs. Rechargeable 15270/15266 Batteries:

• Standard CR2 batteries (15.6x27mm) are not rechargeable.
• 15270 (15x27mm) and 15266 (15x26.6mm) batteries are rechargeable lithium batteries.

15270 batteries range from 3.2V to 3.7V depending on their chemistry and include the following types:

• LiMn204
• LiNiMnCoO2
• LiFePO4
• LiCoO2

Battery Management System:

The Battery Management System (BMS) in the 15270 battery helps prevent overcharging and deep discharge, which are common problems with rechargeable batteries.

Actual observations show that despite these protective measures, 15270 batteries generally have lower capacity than non-rechargeable CR2 batteries.

Cost and Environmental Impact:

Considering the long-term cost and environmental impact, why would one choose a 15270 battery?

Rechargeable batteries like the 15270 can provide several benefits:

• Long-term cost savings
• Reduced environmental impact

In professional photography equipment, rechargeable batteries can reduce operating costs over time, with each charge cycle equivalent to the cost of purchasing a new non-rechargeable battery.

Performance and Maintenance Influences:

• How does the choice between CR2 and 15270 batteries affect device performance and maintenance?
• Compatibility and energy requirements are vital factors in consumer electronics such as:
• LED flashlights
• Advanced medical equipment
• A flashlight using a 15270 rechargeable battery may benefit from consistent performance and reduced interruptions due to fewer battery changes.

CR2 Battery vs. CR123A Battery

Both CR2 and CR123A batteries offer distinctive features, primarily rooted in their lithium-based chemistry. This commonality guarantees high energy density, extended shelf life, and consistent performance across a range of temperatures. But how do their dimensions stack up? The CR2 battery, with its 15.6mm diameter and 27mm length, is notably more compact compared to the larger CR123A battery, which measures 17mm in diameter and 34.5mm in length.

Is this size difference merely trivial? Not exactly. The larger CR123A battery generally boasts higher capacity and delivers greater current output. This performance edge makes it apt for high-drain electronics like flashlights, tactical gear, and advanced photographic equipment. In professional photography, where swift and dependable power bursts are non-negotiable, CR123A batteries often outshine their smaller counterparts, sustaining high energy demands without faltering. Have you ever wondered why photographers might lean towards CR123A? It's because they can't afford to compromise on performance during critical shoots.

However, the CR2 battery's smaller size renders it exceptionally suitable for compact and portable devices. Consider devices like compact cameras or remote controls; the smaller footprint of the CR2 battery becomes invaluable. For instance, when miniaturization is imperative, the CR2 battery's ability to provide adequate power while occupying minimal space makes it an obvious choice. Why juggle with larger batteries when space constraints are at play?

When deciding between CR2 and CR123A batteries, the device’s power requirements and design constraints often dictate the choice. For applications in sensor technology, where longevity and minimal maintenance are essential, CR123A batteries prevail due to their higher capacity. Imagine a remote sensor in a challenging environment; frequent battery changes would be impractical, making the CR123A an optimal choice to ensure uninterrupted sensor performance.

CR2 Battery and 4LR44 (4SR44) Battery

Although the CR2 and 4LR44 (also known as 4SR44) batteries may look similar in size, their electrical and chemical properties diverge considerably. The CR2 battery measures 15.6x27 millimeters and operates at 3.0 volts. In contrast, the 4LR44 battery is 13x25.2 millimeters and has an operating voltage of 6.0 volts. This disparity in voltage and chemistry means they cannot be substituted for one another.

What makes the CR2 battery particularly suitable for high-drain devices like cameras and high-performance flashlights? It relies on lithium-based chemistry, which provides stable performance. This contributes to a longer shelf life and consistent operation, even under extreme temperatures. For instance, many professional wildlife photographers favor CR2 batteries for their ability to sustain steady performance over long periods, regardless of environmental variations. Is this preference merely about longevity? Or is it the reliability that comes in urgent, critical moments?

On the other hand, 4LR44 batteries, often found in dog collars, remote controls, and medical devices, utilize an alkaline or silver oxide composition. These batteries are designed to output a higher voltage, making them suitable for intermittent or less energy-intensive applications. Pet owners, for example, might choose devices powered by 4LR44 batteries for training purposes, accepting the need for more frequent replacements due to their sufficient output.

The ramifications of misusing these non-interchangeable batteries are significant. Employing a CR2 battery in a device meant for a 4LR44 can lead to insufficient power, causing device malfunction. Conversely, inserting a 4LR44 battery in place of a CR2 can cause over-voltage, potentially harming the electronic components. This highlights a crucial practice: always checking battery specifications before making replacements.

Frequently Asked Questions [FAQ]

1. What is a CR2 Battery?

A CR2 battery is a non-rechargeable lithium manganese dioxide (LiMnO2) cylindrical battery, operating at 3.0 volts and measuring 15.6 x 27 mm. Leveraging lithium's high energy density and stable discharge characteristics, it delivers consistent performance, especially in devices requiring sudden energy surges.

2. What are CR2 Batteries Used For?

• Video/photographic equipment: Frequently used by photographers who rely on these batteries to avoid unexpected power failures.
• Smoke detectors
• Security devices
• LED flashlights
• Remote controllers
• Pet collars
• Laser sights

In these applications, the low self-discharge rate and strong current pulses make CR2 batteries a preferred choice.

3. What Batteries Can Replace CR2 Batteries?

To replace a CR2 battery, alternatives need to match the CR2's physical dimensions (15.6 x 27 mm) and voltage (3.0V) specifications. Although different brands offer similar batteries, ensuring compatibility with the device is crucial. Often, branded CR2 batteries deliver better durability and performance, thanks to stringent quality control processes.

4. Are CR2 Batteries the Same as CR123 Batteries?

No, CR2 and CR123A batteries are distinct despite sharing the same chemical makeup. CR123A batteries have a higher capacity for longer operational times in high-drain devices but are physically larger, rendering them unsuitable for devices designed for CR2 batteries. Therefore, verifying the required battery type is essential to avoid incompatibility or potential damage.

5. How Long Should a CR2 Battery Last?

The lifespan of a CR2 battery varies significantly with its application. In low-current applications, it might last between 5-10 years. Factors impacting battery life in high-drain devices include:

• Discharge current
• Usage frequency
• Battery aging
• Cut-off voltage

For example, a CR2 battery in a moderately used digital camera might last several months, while the same battery could serve for years in a low-drain smoke detector. Understanding these variables helps users manage expectations and enhance device performance.