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Selecting the right battery type is helps for maximizing the performance and longevity of electronic devices. CR2 and CR123 batteries are among the most commonly used lithium-based power sources, often considered for high-drain applications. However, these batteries differ in size, capacity, and specific use cases. Understanding their differences ensures compatibility and efficiency when choosing a battery for your device. This guide will break down the characteristics, specifications, and applications of CR2 and CR123 batteries, helping you determine which option best fits your needs.
Figure 1. CR2 vs. CR123
The "CR" prefix in battery classifications follows International Electrotechnical Commission (IEC) standards and denotes lithium-based chemistry, specifically lithium manganese dioxide (LiMnO₂). This chemistry is known for its high energy density and stable discharge, making it widely used in consumer electronics, security systems, and industrial equipment.
Each letter in "CR" has a meaning:
• C represents lithium chemistry as the primary component.
• R indicates a round cell shape.
The numbers following "CR" specify the battery’s dimensions. For example, a 123A battery is approximately two-thirds the length of a standard A-size battery. Some manufacturers omit the "A", but the specifications remain unchanged.
Figure 2. CR123 Battery
A CR123 battery is a compact, high-energy power source with a 3V nominal voltage, designed for small electronic devices that need efficient and reliable power. Its lightweight design and high energy density make it a popular choice for flashlights, cameras, alarm systems, and watches.
A CR123 battery typically has a capacity of 1,500 to 2,500mAh, depending on the manufacturer. It supports continuous currents between 1,000mA and 2,000mA and can handle pulse currents up to 3,000mA when needed. Battery capacity, measured in milliampere-hours (mAh), determines how much energy it can store and deliver over time. For example, a 1,500mAh CR123 battery can power a 100mA device for about 30 hours before depletion.
Choosing the right mAh rating is essential, as it directly affects battery runtime and performance. Devices with higher power needs require batteries with greater capacity to ensure longer operation and optimal efficiency.
Figure 3. CR2 Battery
A CR2 battery is a compact, cylindrical lithium-based power source known for its high energy density and reliable performance. It resembles a smaller version of a D-cell battery, making it ideal for devices that require a balance between size and power output.
CR2 batteries are widely used in cameras, where their high power output ensures consistent performance. They are also commonly found in industrial applications that require long-lasting, efficient lithium batteries. Due to their popularity, CR2 batteries are often in high demand, leading to limited availability in some cases.
Major manufacturers, including Panasonic, Duracell, and Energizer, produce CR2 batteries, ensuring consistent quality and performance across brands. Whether used in professional equipment or consumer electronics, CR2 batteries remain a top choice for compact yet powerful energy solutions in high-drain applications.
Technology is deeply integrated into daily life, with many electronic devices requiring portable power sources instead of direct electrical connections. For example, battery-powered cameras are used for capturing moments while traveling, highlighting the need for compact and efficient batteries.
Batteries convert stored chemical energy into electrical energy through electrochemical reactions, enabling various devices to function. This process relies on electron transfer between metals within a chemical medium, generating an electric current. Each battery cell consists of three key components: electrodes, electrolytes, and separators. The cathode (positive electrode) receives electrons from the external circuit, while the anode (negative electrode) releases them, generating a continuous flow of current. Electrolytes facilitate ion movement between the electrodes, enabling energy transfer. Depending on the design, a battery may contain one or multiple cells to achieve the required voltage and capacity.
Both CR2 and CR123 batteries function using this electrochemical process but differ in size, capacity, and application. Understanding their composition and operational characteristics helps determine which battery best suits specific electronic devices, ensuring optimal performance and longevity.
CR2 and CR123 batteries are widely used lithium-based power sources, valued for their high energy output and compact size. Despite their similarities, they have distinct specifications that affect their applications. Choosing the right battery requires understanding their differences in construction, voltage, dimensions, runtime, rechargeability, and capacity (mAh rating).
Figure 4. Comparing CR2 vs. CR123
Both CR2 and CR123 batteries use lithium chemistry, which is preferred for its lightweight design, high energy density, and long shelf life. These qualities make them ideal for high-drain consumer and industrial electronics.
Both battery types operate at a nominal voltage of 3V, making them electrically similar. When replacing a battery, voltage compatibility is crucial—using a higher voltage than specified can damage the circuit or cause malfunctions.
• CR123 batteries measure 34.5mm in length and 17mm in diameter.
• CR2 batteries are 27mm long, making them 6.5mm shorter, with a 15.6mm diameter, which is 1.4mm narrower than CR123 batteries.
• CR2 batteries have a lower capacity, typically lasting 5.5 to 8 hours under standard usage.
• CR123 batteries last significantly longer, with a runtime of 6 to 50 hours, depending on the device’s power consumption.
Most modern electronics use rechargeable batteries for cost efficiency and reduced waste. However, CR2 and CR123 batteries are non-rechargeable by default. Once depleted, they cannot be recharged or reused.
That said, both batteries have a low self-discharge rate, meaning they can retain power for long periods. On average, they lose only 5% of their charge per month, making them ideal for devices that require long-term storage without frequent replacements.
• CR2 batteries range from 400 to 800mAh, suitable for low-drain devices.
• CR123 batteries have a much higher capacity, between 1,500 and 2,500mAh, making them more reliable for high-drain applications like flashlights, cameras, and security devices.
Batteries are classified as either primary (non-rechargeable) or secondary (rechargeable). Determining whether CR2 and CR123 batteries fall into these categories requires analyzing their specifications.
Both CR2 and CR123 are primary batteries, meaning they cannot be recharged or reused once depleted. They must be replaced with new batteries. Attempting to recharge them can cause safety hazards, such as leakage or overheating.
While some rechargeable versions of CR123 batteries exist, they have a different design and require specific chargers. However, standard CR2 and CR123 batteries are single-use, offering long-lasting and stable power without the need for recharging.
Choosing between CR2 and CR123 batteries depends on device requirements. Since electronic devices are designed for specific battery types, selecting the right one requires matching the power specifications and size compatibility.
Voltage compatibility is a key factor. If a device is designed for a 3V battery, using a higher voltage—such as 5V—can damage the circuit and cause malfunctions or permanent failure. Battery size also matters, as CR2 and CR123 batteries have different dimensions and are not interchangeable.
For long-lasting power, CR123 batteries are the better option. Their higher mAh rating provides greater energy capacity, making them ideal for high-drain devices like security cameras, tactical flashlights, and medical equipment. Their extended lifespan makes them a reliable choice for applications requiring consistent performance over long periods.
On the other hand, CR2 batteries are more suitable for compact, lightweight devices, such as small flashlights and specialty electronics. While they offer dependable power, they have a lower capacity than CR123 batteries, making them better for shorter usage durations.
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FPGA / CPLD
Memory
MOS 
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DSP
OCEP
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