Lithium CR2 Battery
Lithium CR2 battery is a non-rechargeable 3.0V battery suitable for both high-discharge applications and for long-term standby applications.
Lithium CR2 battery is a lightweight battery featuring large capacity, low internal resistance, and very low self-discharge rate and is commonly used in cameras and photographic equipment, compact EDC flashlights, security and medical devices, and similar.
CR2 Battery Features and Specifications
CR2 battery is cylindrical battery featuring physical dimensions of (D x H) 15.6 x 27.0 mm (0.614 x 1.063 inches).
The most common label for non-rechargeable manganese-dioxide lithium 15.6 x 27.0 mm 3.0V battery is 'CR2 battery', but other labels are used as well, including CR15H270 (IEC), 5046LC (ANSI), CR15270, etc.
The nominal voltage is 3.0 volts, cutoff voltage is, in theory, ~2.0 volts, but in practice, many devices drain these batteries even below 2.0 volts.
Nominal capacity is 800-850 mAh when the battery is being discharged at room temperature with 10-20 mA currents.
However, since these batteries are commonly used in high-discharge devices (cameras, for example), pulse current is often more important than low-drain performance.
On average, a good CR2 battery is able to provide 900-1000 pulses/cycles of 900 mA current for 3 seconds ON and 27 seconds OFF at room temperature down to 1.5-2.0 volts, model dependent.
Another very important feature of CR2 batteries is their very low self-discharge rate which is often less than 1% per year. Such a low self-discharge rate allows these batteries to be used in EDC, security and medical devices, and other standby/backup systems that require reliable sources of power even after years of storage.
CR2 vs RCR2 vs 15270 (15266) Batteries
Rechargeable 15.6 x 27.0 mm lithium-ion cylindrical batteries feature nominal voltage of 3.6-3.7 volts, nominal capacity of 300-400 mAh and are commonly labeled as RCR2 (Rechargeable CR2) battery, 15270 battery, 15266 battery, and similar.
Although voltage difference between CR2 and 15270 batteries is 'only' 0.6-0.7 volts, even such voltage difference may cause issues in operation or even damage to sensitive equipment - 3.0V CR2 battery can be replaced with 3.6-3.7V 15270/15266 battery ONLY if the device's manufacturer clearly states that the device can be powered by both batteries.
Note: some manufacturers of 15270 batteries offer models with integrated Battery Management System that steps down the output voltage from 3.6-3.7 volts to 3.0 volts - such 15270 batteries may be used as direct replacements of 3.0V CR2 batteries.
Also, some manufacturers offer rechargeable lithium manganese-dioxide batteries with 3.0V output voltage that also can be used as direct replacements for CR2 batteries.
Note: all rechargeable batteries should be charged with the battery chargers intended for such batteries, or they can overheat, burst to flames or even explode!
CR2 Battery vs CR123A Battery
Both CR2 and CR123A batteries are non-rechargeable 3.0V lithium batteries, differing in size and thus, capacity and discharge performance:
- CR2 battery: 15.6 x 27.0 mm, 800-850 mAh capacity,
- CR123A battery: 17.0 x 34.5 mm, ~1500 mAh capacity.
Both battery types feature very low self-discharge rates and they easily power high-drain devices.
CR2 battery is smaller and it is used in more compact devices.
CR2 Battery Cross Reference Chart
The following cross reference chart lists some of the most popular 3.0V non-rechargeable lithium CR2 battery models with their most important features and specifications:
|Battery||Nominal and Cutoff Voltage||Capacity||Operating Temperature||Annual Self-Discharge Rate||Discharge Currents||Datasheet|
|Energizer CR2||3.0V/2.0V||800 mAh, 100Ω @21°C down to 2.0V||-40°C to +60°C||~1%||
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||3.0V/1.8V||800 mAh, @10 mA @23°C down to 1.8V||-40°C to 60°C||~1%||
10 mA continuous
900 mA, 3s/27s, @23°C, 900 cycles, down to 1.6V
|Panasonic CR2||3.0V||850 mAh||-40°C to +70°C||-||
20 mA continuous
900 mA, 3s/27s, @20°C, 1000 cycles, down to 1.8V
|Varta CR2||3.0V/2.0V||850 mAh, @20mA @20°C down to 2.0V||-40°V to +70°C||<1%||
20 mA continuous
900 mA, 3s/27s, @25°C, 900 cycles, down to 1.5V
As one can see, some manufacturers provide cycle use data for 3s/27s cycles, while some manufacturers (Energizer in this chart) provide cycle use data for 3s/7s cycles - such shorter cycles stress the battery more than 3s/27s cycles but are more realistic to everyday use of these batteries.
Note: even under such load, the Energizer CR2 battery feature an actual capacity of ~760 mAh (down to 1.8V), which is very close to the battery's nominal capacity of 800 mAh (down to 2.0V).
Long Story Short: CR2 batteries are very common batteries and can be found at most hardware or even office stores and at online shops.
When looking for a new CR2 battery, go for the popular models from reputable brands that have been tested by numerous users and have good reviews - such batteries will serve You well for years ahead.