2CR5 Batteries: How to Choose the Right 6V Lithium Photo Battery

2CR5 batteries are 6-volt primary (non-rechargeable) lithium cells designed for high-pulse camera and instrument workloads in a compact rectangular format. They are common in 35mm film SLRs, some early digital cameras, select flash units, security sensors, and specialized medical/industrial equipment.

Key Specs and Compatibility

• Nominal voltage: 6V (primary lithium, Li-MnO2)
• Typical capacity: 1400–1700 mAh (varies by brand and load)
• Size: ~34 × 17 × 45 mm
• Shelf life: up to 10 years when stored properly
• Common equivalents on packaging: 2CR5, 245, DL245, EL2CR5

Important: 2CR5 is not the same as CR-P2 (often marked 223). Do not substitute unless your device lists both as compatible.

When to Choose 2CR5

• Use if your camera or device specifically lists 2CR5/245/DL245/EL2CR5.
• Good for high-pulse loads (autofocus, shutter, and flash triggering) where steady 6V output is required.
• Choose for long standby life: emergency kits, infrequently used cameras, or sensors.

• Avoid if your device supports only rechargeable packs or a different size (e.g., CR-P2, proprietary Li-ion).
• Avoid “DIY” substitutions (e.g., taping two CR123A cells) without a purpose-built adapter approved by the device maker.

How to Pick a 2CR5 Battery

1. Match the code: Check your device and manual for 2CR5/245/DL245/EL2CR5. Do not mix with CR-P2 or other 6V photo formats unless listed.
2. Capacity and pulse rating: For cameras and flash triggers, favor brands that publish both mAh and pulse discharge specs for faster, more consistent operation.
3. Temperature range: Typical operation is -4 to 140°F (-20 to 60°C). If shooting outdoors in extreme conditions, pick a version rated for wider temps per datasheet.
4. Freshness: Choose recent date codes and sealed packaging; lithium primaries have long shelf lives but perform best when fresh.
5. Brand and warranty: Reputable photo/industrial brands offer tighter QC and clear datasheets—useful for critical gear.

Performance: What to Expect

• Film SLR body power: Often months of occasional use (varies with autofocus frequency, metering, and ambient temperature).
• Flash/triggers: Typically hundreds of pops; rapid recycle and high power shorten runtime.
• Low-drain sensors: Multi-year service is possible due to low standby draw.

Actual runtime depends on device current draw, temperature, and shooting behavior (e.g., frequent flash).

Rechargeable vs. Primary

• Primary 2CR5 (recommended): Maximum shelf life and capacity; ideal for cameras and critical instruments.
• Rechargeable “2CR5” packs: Rare and often Li-ion with different voltage behavior. Use only if your device documentation explicitly supports them and with the specified charger.

Never attempt to recharge a primary 2CR5—this can cause leakage or fire.

Care, Storage, and Safety

• Store cool and dry, around 50–77°F (10–25°C), away from metal objects.
• Do not mix brands, old/new cells, or chemistries in the same device.
• Inspect for swelling or leakage after long storage; replace if compromised.
• Recycle at designated battery collection points; do not incinerate.
• For air travel, keep batteries in retail packaging or a plastic case to prevent short circuits.

Alternatives and Compatibility Notes

• Two CR123A cells: Electrically similar in series but only safe with a purpose-built 2CR5 adapter approved by the device maker.
• CR-P2 (223): Different shape; only use if your device lists it as compatible.
• Proprietary camera packs: Some cameras accept only OEM Li-ion packs; follow the manual.

Quick Buying Checklist

• Correct code (2CR5/245/DL245/EL2CR5) confirmed in the manual
• Fresh date code and sealed packaging
• Published mAh and pulse specs suitable for your device
• Temperature rating matches your shooting environment
• Reputable brand with recycling guidance

FAQ

Can I replace a 2CR5 with two CR123A batteries?

Only with a proper 2CR5-shaped adapter approved by your device manufacturer. Loose cells or improvised setups can damage the device or create a safety hazard.

Is 2CR5 the same as CR-P2?

No. They are both 6V lithium photo batteries but have different shapes. Use only the type your device specifies.

How long will a 2CR5 last in a camera?

Anywhere from a few weeks of heavy, flash-intensive use to many months of occasional shooting, depending on autofocus use, temperature, and brand.

Are 2CR5 batteries allowed on airplanes?

Yes. Carry them in retail packaging or a protective case to prevent short circuits and follow airline guidance for spare batteries in carry-on baggage.

How should I dispose of a used 2CR5?

Recycle through a battery collection program or retailer drop-off. Do not throw in household trash.