Procell Constant CR2

Procell Constant CR2 Battery (3V) — Professional Lithium Power for Compact Devices

The Procell Constant CR2 is a professional 3V lithium battery designed for reliable, steady power in compact devices. It is a strong fit for wireless security sensors, golf rangefinders, laser tools, key fobs, and select cameras where low maintenance and long shelf life matter.

At a Glance

• Chemistry: Lithium Manganese Dioxide (Li‑MnO2), non‑rechargeable
• Voltage: 3 V nominal
• Typical capacity: ~720–800 mAh (device/load dependent)
• Size code: CR2 / IEC CR15H270
• Dimensions: approx. 27.0 mm (L) × 15.6 mm (D) • 1.06 × 0.61 in
• Operating temperature: about −4°F to 140°F (−20°C to +60°C)
• Shelf life: up to 10 years; low self‑discharge
• Packaging: industrial bulk for consistent lot/date codes

When to Choose This Battery

• Use if you need steady, long‑lasting power in compact, low‑to‑moderate drain devices (e.g., PIR motion sensors, door/window contacts, rangefinders, laser sights, small test instruments).
• Use if long shelf life and infrequent maintenance are priorities (spares stored for months to years).
• Avoid if the device specifies a rechargeable 15270 (3.7 V) cell or requires a larger CR123A/CR-V3 format.

Estimated Runtime Examples

Actual life varies with load, temperature, and duty cycle. These examples help set expectations:

• Wireless motion sensor averaging 40 μA: roughly 1.5–2.5 years.
• Door/window contact averaging 20 μA: roughly 2–3 years.
• Golf rangefinder with occasional use: about 6–12 months for casual play.

Compatibility Notes

• Look for “CR2” marking in the battery bay or manual. Not interchangeable with CR123A, CR‑V3, 2CR5, or 15270 (rechargeable) cells.
• Do not mix old and new cells, or different brands/chemistries, in the same device.
• Install with correct polarity; clean contacts if the device intermittently powers off.

Installation and Best Practices

1. Power off the device and note polarity.
2. Replace all cells at once if the device uses more than one.
3. After installation, run a quick function test (e.g., trigger a sensor or take a reading).

Storage and Handling

• Store cool and dry (ideally 50–77°F / 10–25°C). Avoid heat and direct sun.
• Keep in original packaging until use to limit short circuits and terminal contamination.
• For long-term spares, label install dates to simplify maintenance cycles.

Safety and Disposal

• Non‑rechargeable: never attempt to recharge, crush, or incinerate.
• Avoid short‑circuiting. Transport with terminal protection.
• Recycle according to local regulations for lithium primary cells; tape terminals before recycling.

Quick Specs

Type	CR2 (Primary lithium)
Chemistry	Li‑MnO2
Nominal Voltage	3 V
Typical Capacity	~720–800 mAh
Operating Temp	−20°C to +60°C (−4°F to 140°F)
Size (L × D)	27.0 × 15.6 mm (1.06 × 0.61 in)

Alternatives and Upgrades

• If your device demands higher pulse currents or longer runtime in a larger format, check if it supports CR123A instead.
• If you specifically need rechargeability, only use a 15270 (rechargeable CR2‑size, ~3.7 V) when the device manual lists it as compatible.

FAQ

Is the Procell Constant CR2 rechargeable?

No. It is a primary lithium cell and must not be recharged.

How long can I store spares?

Up to about 10 years in cool, dry conditions thanks to low self‑discharge. Check date codes and rotate stock annually.

Will a CR2 fit where a CR123A is specified?

No. They are different sizes and capacities. Use only the size listed by the device manufacturer.

Why choose an industrial Procell version?

Bulk packaging, consistent lot/date codes, and testing standards suited for professional maintenance cycles.