Panasonic CR123a Batteries

Overview

Panasonic CR123A (model CR17345) is a 3V lithium manganese dioxide (Li‑MnO₂) primary battery engineered for high‑drain and pulse‑demand devices. It delivers stable voltage, long shelf life, and reliable performance across extreme temperatures—ideal for LED flashlights, cameras, and security sensors.

Key specs

• Chemistry: Li‑MnO₂ (primary, non‑rechargeable)
• Nominal voltage: 3.0 V
• Typical capacity: up to ~1550 mAh (at moderate load, to 2.0 V cutoff)
• Operating temperature: −40°C to +70°C (−40°F to 158°F)
• Dimensions: 17.0 mm diameter × 34.5 mm length (CR123A/CR17345)
• Weight: approx. 17 g
• Shelf life: up to 10 years (stored at room temperature)

When to choose Panasonic CR123A

• Emergency kits and infrequently used gear—very low self‑discharge keeps cells ready for years.
• High‑drain pulses—tactical flashlights, range finders, motion sensors, and camera accessories.
• Cold or hot environments—performs where alkaline cells struggle or fail.

Consider these alternatives

• 16340/RCR123A (rechargeable) if your device supports 3.6–3.7 V cells and you can recharge regularly to reduce running costs.
• 18650 or AA‑based devices if you need much longer continuous runtime and can accommodate larger formats.

Compatibility and use notes

• Use only if your device specifies CR123A/CR17345. Do not substitute with CR2, 2CR5, or other formats.
• Do not use rechargeable 16340/RCR123A unless the device explicitly allows them—their voltage is higher.
• For devices using two CR123A in series, replace both at the same time with matching brand and age.
• Do not recharge, short‑circuit, crush, or incinerate. Risk of leakage or venting.

Expected runtimes (approximate)

Device/Load	Current draw	Typical runtime	Notes
LED flashlight (high)	1.0 A	1–1.3 hours	Brightness may step down as voltage drops.
LED flashlight (medium)	300 mA	3–5 hours	Runtime depends on driver efficiency and cutoff.
Motion sensor (avg.)	20 mA	~2–3 days continuous equivalent	Real devices sleep; service life is typically months.
Camera remote/meter	5 mA	10+ days continuous	Intermittent use extends life significantly.

Estimates assume typical capacity at room temperature. Actual runtime varies with device design, cutoff voltage, and ambient temperature.

Storage and safety

• Store cool and dry; avoid direct sun and high heat. Keep terminals covered to prevent shorting.
• Transport in original packaging or a battery case—never loose in a pocket or bag with metal objects.
• Recycle per local regulations for primary lithium batteries; do not dispose in fire.
• Keep out of reach of children. If swallowed, seek immediate medical help.

FAQ

Is this battery rechargeable?

No. CR123A is a primary (single‑use) lithium battery. Attempting to recharge can cause leakage or venting.

What’s the difference between CR123A, 16340, and RCR123A?

CR123A is 3.0 V and non‑rechargeable. 16340/RCR123A are rechargeable cells with 3.6–3.7 V nominal voltage. Only use what your device specifies.

Can I mix old and new batteries?

No. If your device uses two CR123A in series, replace both together with cells of the same brand and age to avoid imbalance.

Will they work in cold weather?

Yes. Panasonic rates operation from −40°C to +70°C. Capacity will drop in extreme cold, but performance remains far better than alkaline cells.