A CR2 3.0V lithium battery is a non-rechargeable lithium-manganese dioxide (Li-MnO₂) cell with a nominal voltage of 3 volts. Designed for high-drain devices, it delivers stable power in compact applications like laser rangefinders, security alarms, and film cameras. Measuring approximately 15.1mm in diameter and 26.6mm in height, these batteries prioritize long shelf life (up to 10 years) and leak-resistant construction. Brands like Panasonic, Kodak, and Hongli Energy produce CR2 cells with capacities around 800–1000mAh, optimized for low-temperature performance and consistent voltage output.
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What defines the technical specifications of CR2 batteries?
CR2 batteries operate at 3.0V nominal voltage, with a termination voltage of 1.5V to prevent deep discharge. Their lithium-manganese chemistry enables a 1000mAh capacity range, supporting currents up to 150mA. Pro Tip: Always verify device voltage tolerances—CR2’s 3.4V open-circuit voltage may overload 3V-sensitive circuits.
CR2 cells adhere to strict IEC/ANSI standards, ensuring compatibility across brands. The cylindrical design incorporates dual venting ports to mitigate internal pressure risks. For example, Hongli Energy’s CR2 models use alloy terminals with anti-corrosion coatings, enhancing durability in humid environments. Transitional phrase: Beyond basic dimensions, the internal spiral electrode structure maximizes surface area for efficient energy release. Practically speaking, devices like the Fujifilm Instax SQ6 require precise 15.1mm diameter cells—even a 0.5mm deviation can cause fitment failures. But how do these specs compare to similar batteries?
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| Parameter | CR2 | CR123A |
|---|---|---|
| Diameter | 15.1mm | 17.0mm |
| Capacity | 800–1000mAh | 1500mAh |
| Typical Use | Compact cameras | High-lumen flashlights |
Where are CR2 3.0V batteries commonly used?
CR2 batteries power low-drain professional devices requiring compact energy sources. Key applications include laser distance meters (e.g., Leica DISTO), vintage film cameras like the Praktica X1D, and smoke detectors. Transitional phrase: Additionally, their stable voltage curve makes them ideal for medical devices like glucometers, where power consistency is critical.
Photography enthusiasts frequently use CR2 cells in Lomography Instant cameras, as seen with the Lomo’Instant Square. Pro Tip: Always carry spare CR2 batteries during outdoor shoots—cold weather can reduce capacity by 15–20%. Real-world example: A 1000mAh CR2 in a security sensor typically lasts 6–9 months, outperforming alkaline alternatives in temperature extremes. But what happens when devices demand higher currents? Unlike CR123A cells, CR2’s thinner design limits peak discharge rates, making them unsuitable for tactical flashlights.
How do CR2 batteries compare to rechargeable alternatives?
CR2 cells prioritize instant availability over reusability, with lithium-manganese chemistry providing 2–3× the energy density of NiMH. However, non-rechargeable designs generate more waste—eco-conscious users may prefer Li-ion RCR2 variants despite lower 500mAh capacities.
Transitional phrase: While rechargeable RCR2 batteries exist, their 3.7V nominal voltage often requires voltage regulators. For instance, retrofitting a Kodak CR2-powered rangefinder with RCR2 cells risks damaging light metering circuits. Pro Tip: Check device manuals for lithium compatibility—some gadgets explicitly prohibit rechargeables. Real-world example: A 3V CR2 lasts 300 shots in a Fujifilm Instax Mini 90, whereas an RCR2 might only manage 150 shots but allows 500+ recharge cycles. Is the trade-off worth it? For mission-critical devices, disposable CR2’s reliability often outweighs sustainability concerns.
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FAQs
No—CR2’s 15.1mm diameter vs. CR123A’s 17mm creates fit issues. Voltage differences (3V vs. 3.7V Li-ion) also risk device damage.
Can CR2 batteries be stored long-term?
Yes—store at 20°C in original packaging to maintain 95% capacity after 10 years. Avoid temperatures above 40°C to prevent self-discharge acceleration.