Part Number CR2
Chemical System Lithium / Manganese Dioxide (Li/MnO2)
Typical Lithium content 0.28 grams
Nominal voltage (Open circuit voltage) 3.0V
Typical capacity 800mAH (to 2.0volts, rated at 100 ohms at 21℃)
Nominal capacity 850mAH
Continuous drain (standard discharge current) 20mA
Dimensions 15.6 mm (max diameter) 27.0 mm (max height)
Typical Weight 11.0g
Typical volume 5.2 cm3
Temperature range Discharge: -40℃ to 60℃ Storage: -40℃ to 75℃
Maximum continuous discharge current 1000 mA continuous (2500 mA pulse)
Maximum reverse charge 2 µA
CR2 Battery Manufacturer Discharge Current Cycles (On/Off testing in Secs) Volts at Room Temperature Capacity
Energizer Continuous maximum drainage of 1000 mA, with a max pulse of 2500 mA 400 cycles (3s/7s) 760 cycles (3s/7s) 1.8V 1.8V 800 mAh (down to 2V, @21℃), rating of 100 ohms.
Panasonic Continuous drain of 20mA, with a max. pulse of 900 mA 1000 cycles (3s/27s) 1.8V 850 mAh
GP2 Continuous drain of 10mA, with a max. pulse of 900 mA 900 cycles (3s/27s) 1.6V 800 mAh (down to 1.8V, @23℃)
Varta Continuous drain of 20mA, with a max. pulse of 900 mA 900 cycles (3s/27s) 1.5V 850 mAh (down to 2.0V, @25℃)
Type/Label Chemistry Nominal Voltage (per cell) Charging Voltage Other Notes
IMR 15270 Lithium Manganese Oxide (LiMn2O4) 3.6 to 3.7V 4.2V Used for high drain devices (10-20C). Deliver large currents.
INR 15270 Lithium Manganese Nickel (LiNiMnCoO2) 3.6 to 3.7V 4.2V Slightly lower capacities, but still deliver large currents.
IFR 15270 Lithium Iron Phosphate (LiFePO4) 3.2 to 3.3V 3.5 to 3.6V They are the safest.
ICR 15270 Lithium Cobalt Oxide (LiCoO2) 3.6 to 3.7V 4.2V High capacities, but draw a limited current amount.

Featured Image from: Flickr by Mark Turnauckas