How Many Volts Is a CR2 Battery? | Voltage Specs Explained

A CR2 battery delivers 3.0 volts nominal, with fresh cells reading up to 3.3 volts before settling under load.

Most devices built for CR2 lithium cells run on a 3.0-volt nominal rating that stays fairly flat through most of the discharge cycle. Fresh open-circuit voltage typically reads higher — around 3.2 to 3.3 volts — then drops toward a 2.0-volt cutoff as the cell depletes. This consistent voltage profile is exactly why cameras, flashlights, and medical devices rely on CR2 primaries, and why engineers design their circuits around that stable 3-volt window.

CR2 Voltage: Nominal vs. Fresh vs. Cutoff

Understanding a CR2 battery means knowing three separate voltage numbers, not one. The nominal voltage is the design rating engineers use. Fresh voltage is what a multimeter shows before the cell works. Cutoff voltage is where the device stops drawing power.

The cell holds near 3 volts for most of its life, then drops sharply once depleted.

What Voltage Means for Your Device

Lights dim, cameras refuse to fire, and sensors give erratic readings when voltage sags past the cutoff. If your device reads voltages while running, expect a long plateau near 3.0, a quick slide through 2.5, and shutdown around 2.0. Replace cells before that cliff or you’ll hit the sharp drop mid-use.

CR2 Battery Specs Compared By Brand

Not all CR2 cells perform identically, even though they share the same voltage rating. Capacity differs between brands, along with weight and operating temperature range.

The real difference shows in runtime, not fit.

CR2 vs. RCR2: Why 3.7V Changes Everything

A CR2 and an RCR2 look nearly identical but are not interchangeable. Feeding 3.7V into a circuit designed for 3.0V can fry components, trigger protection circuits, or produce dangerous heat.

The sizing also matters. Never assume a rechargeable version works as a drop-in replacement.

Identifying the Right Cell

Look for the chemistry code printed on the battery or in the device manual. Standard CR2 cells are primary lithium, non-rechargeable, and safe to use only once. If the device specifically asks for a rechargeable RCR2, it was engineered for that higher voltage — installing the 3.0V primary will simply underpower it.

Common CR2 Mistakes and Safety Notes

Mistakes with CR2 batteries come down to three recurring errors. Mixing up CR2 and RCR2 tops the list, followed by assuming all CR2 cells share one capacity figure, and treating nominal 3.0 volts as an exact measured fresh voltage. None of these damage a device permanently — until the wrong cell goes in.

Recharging a standard CR2 is hazardous. These are primary cells with no recharge chemistry, and forcing current through one can cause leakage or rupture.

Use the specific cell’s datasheet for your temperature limits and cutoff values rather than assuming one universal range.

If you’re ready to stock up, our tested roundup of the best CR2 3V batteries compares the top options side by side so you pick the right brand for your gear.