CR123A and 123A batteries are the same type of 3.0-volt lithium battery, known for being small, powerful, and long-lasting. They are used in many devices like cameras, flashlights, alarms, and medical tools. This article explains their features, benefits, safe use, and possible alternatives.
CR123A/123A Overview
CR123A and 123/123A batteries are basically the same type of 3.0-volt lithium manganese dioxide cell, widely recognized for their compact size and high energy density. The only difference lies in labeling conventions: some manufacturers use CR123A, while others shorten it to 123 or 123A. Despite the variation in names, these designations all refer to the same standardized battery. International standards also confirm this equivalence, with the IEC code CR17345 and the ANSI code 5018LC both pointing to the same format. This consistency ensures that devices built for CR123A batteries can safely use cells marked as 123 or 123A without compatibility issues.
CR123A/123A Size and Naming
The CR123A battery follows a standardized physical format that makes it easy to identify and replace. It measures 17 millimeters in diameter and 34.5 millimeters in height, fitting consistently across compatible devices.
Depending on the manufacturer, you may also find it under brand-specific labels, such as:
• DL123A – Duracell
• EL123A – Energizer
• K123A – Kodak and others
Technical Details
| Parameter | CR123A / 123A (Typical) |
|---|---|
| Nominal Voltage | 3.0 V |
| Capacity | 1500–1550 mAh |
| Dimensions | Ø 17.0 mm × 34.5 mm |
| Weight | 16–17 g |
| Operating Temperature | −40 °C to +60/70 °C |
| Shelf Life | Up to 10 years |
| Safety Feature | Built-in PTC protection against short-circuit |
Different Uses of CR123A/123A
Flashlights and Tactical Lights
CR123A batteries are popular in LED flashlights, tactical and high-lumen models, because they deliver high power and work well in extreme temperatures.
Digital and Film Cameras
They are used in professional and compact cameras, powering flashes and ensuring consistent performance during long photo sessions.
Security and Alarm Systems
Many motion detectors, smoke alarms, and wireless security sensors rely on CR123A batteries for long-lasting, maintenance-free operation.
Medical Devices
They power portable medical tools like blood pressure monitors, glucose meters, and some emergency equipment, where reliability is crucial.
Military and Tactical Gear
Due to their rugged design and ability to function in harsh environments, CR123A cells are used in night-vision goggles, scopes, and communication devices.
Smart Home Devices
Modern smart locks, sensors, and wireless devices often use CR123A batteries because of their compact size and long shelf life.
Don’t Mix CR123A With Rechargeable 16340
It’s basic to know that CR123A and 16340 (also called RCR123A) may look the same in size, but they are not the same in performance. A standard CR123A is a non-rechargeable lithium-manganese dioxide cell that provides a steady 3.0 V output. In contrast, a 16340 or RCR123A is a rechargeable lithium-ion cell that delivers 3.6–3.7 V when in use and can reach up to 4.2 V when fully charged.
This voltage difference can be required. Many devices, such as cameras, flashlights, and security sensors, are designed specifically for 3.0 V primaries. Using a 16340 in these systems may cause overheating, malfunction, or permanent damage. Unless your device clearly states it supports RCR123A/16340 rechargeables, it is safest to stick with regular CR123A batteries.
CR123A Compatibility Guide
• Always confirm your device label: if it lists CR123A, 123, 123A, CR17345, or 5018LC, then standard CR123A batteries are the correct match.
• If the device label says Rechargeable, do not use primary CR123A cells; these require RCR123A/16340 instead.
• When your device needs two batteries, replace both cells at the same time to maintain balanced performance.
• Never mix old and new batteries, or combine different brands in the same device, as this can shorten runtime or cause damage.
• Store spares in a cool, dry place and check the shelf life to ensure maximum reliability when installed.
• Avoid using CR123A in chargers not designed for them; these batteries are non-rechargeable, and attempting to charge them can be hazardous.
CR123A Battery Temperature, Shelf Life, and Storage
| Aspect | Details |
|---|---|
| Operating Temperature | Works reliably between −40 °C and +60/70 °C, suitable for cold and hot conditions. |
| Shelf Life | Up to 10 years, thanks to a very low self-discharge rate. |
| Storage Practice | Keep in a cool, dry place, away from direct sunlight. |
| What to Avoid? | Do not store in glove compartments, cars, or other high-heat areas, as this reduces lifespan. |
Best Alternatives for CR123A/123A
• RCR123A (16340)
• CR17345
• 5018LC
• DL123A
• EL123A
Conclusion
CR123A and 123A batteries are dependable power sources that combine compact size, high energy capacity, and long shelf life. They work well on many devices and remain stable across a wide temperature range. By understanding their specifications and avoiding confusion with rechargeable versions, you can ensure safe, consistent, and reliable performance.
Frequently Asked Questions [FAQ]
Can I take CR123A batteries on a plane?
Yes, they are allowed. Keep spares in carry-on, terminals covered or in packaging.
How are CR123A batteries different from AA lithium batteries?
CR123A gives 3.0 V and higher current; AA lithium gives 1.5 V and is cheaper but less powerful.
How should CR123A batteries be disposed of?
Recycle them at approved centers. Do not throw in household trash.
What is the internal resistance of CR123A batteries?
Usually under 200 mΩ. Low resistance lets them deliver strong current bursts.
Do CR123A batteries lose charge in storage?
Very slowly. Self-discharge is about 1–2% per year.
Can CR123A batteries handle high-drain devices?
Yes, but heavy continuous use shortens runtime and increases heat.