Energizer CR2 Battery

Energizer CR2 Lithium Battery

A compact, high-drain 3V primary lithium cell designed for cameras, laser rangefinders, motion/security sensors, and compact flashlights. Choose CR2 when your device explicitly lists “CR2” or “CR17355.”

At-a-Glance Specs

Chemistry	Lithium/Manganese Dioxide (Li/MnO2)
Nominal voltage	3 V
Typical capacity	~800 mAh (at moderate load)
Size / Standard	CR2 / CR17355
Dimensions	≈ 27 mm (L) × 15.6 mm (Ø)
Operating temperature	-40°C to 60°C (-40°F to 140°F)
Shelf life	Up to 10 years (room temperature, unopened)
Rechargeable	No (primary cell)

When to Choose It

• Use if your device specifies CR2/CR17355 and needs dependable power in a small form factor.
• Use for photo gear (film/compact cameras, flash triggers), laser rangefinders, motion/PIR sensors, and compact tactical lights.

Avoid If

• Your device requires CR123A, AA, or another size—these are not interchangeable.
• You need rechargeability—most devices that accept CR2 do not support rechargeable substitutes.

Compatibility Notes

• Label equivalents: CR2, CR17355. Not the same as CR123A (larger, higher capacity).
• Rechargeable look-alikes (e.g., 15270/15266) are typically 3.6–3.7 V per cell and may damage devices not designed for them. Use only if the device manual explicitly allows.
• Install with correct polarity; do not mix old and new cells or different brands/chemistries.

Expected Runtime Examples

Actual life varies by device draw, temperature, and usage patterns. Typical ranges:

• Motion/PIR sensors (smart home/security): often 6–24 months with moderate activity.
• Laser rangefinders: hundreds to thousands of measurements per cell.
• Film/compact cameras: typically hundreds of shutter cycles/autofocus operations; heavy flash use reduces runtime.
• Compact flashlights: a few hours of continuous high output; significantly longer on low modes.

Storage, Handling, and Safety

• Store cool, dry, and in original packaging; avoid heat, moisture, and metal-to-metal contact.
• Do not recharge, disassemble, crush, or incinerate. Primary lithium cells can vent if misused.
• Remove from devices stored long-term to prevent deep discharge.
• Keep out of reach of children. Seek immediate medical help if a battery is swallowed.
• Recycle at an approved battery drop-off; do not dispose in household trash.

Alternatives

• Rechargeable need: Only consider 15270/15266 if the device documentation explicitly supports them (higher voltage risk).
• Higher capacity need: If the device specifies CR123A, use CR123A instead; do not substitute CR2.

FAQ

Is the Energizer CR2 rechargeable?

No. It is a primary (single-use) lithium battery. Do not attempt to recharge.

How do I know if CR2 will fit my device?

Check the device, battery compartment, or manual for “CR2” or “CR17355.” If it lists CR123A, AA, or another code, do not use CR2.

Can I mix a new CR2 with a partially used one?

No. Mixing new and used cells or different brands/chemistries can cause leakage, reduced performance, or device damage.

What storage conditions maximize shelf life?

Room temperature (20–25°C / 68–77°F), low humidity, and original packaging. Avoid freezing or leaving in hot cars.

What should I do with spent CR2 batteries?

Recycle through a local battery recycling program or hazardous waste facility. Do not throw in household trash.