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When powering high-performance devices like cameras and flashlights, CR123 and CR123A batteries are the most common options. Both are compact, cylindrical lithium batteries with similar voltage and size.
So, how should we choose? In this guide, we’ll explore the features of CR123 and CR123A batteries. Additionally, we compare their differences and similarities. Help you decide which type best suits your needs.
CR123 is a compact, high-energy lithium battery. It typically measures about 17 mm in diameter and 34.5 mm in length. Actually, the name "CR123" tells us about the battery's chemistry and size.
These batteries operate at a nominal voltage of 3 volts. Compared to standard alkaline batteries, they offer a higher energy density and longer shelf life.
Security systems, smoke detectors, medical instruments, and LED flashlights often use them. CR123 lithium battery is known for its low self-discharge rate and stable performance in extreme temperatures ( –40°C to +70°C).
This makes them ideal for both everyday use and long-term storage. Most CR123 batteries are non-rechargeable. Of course, there are rechargeable versions (RCR123) are available for users who prefer a sustainable and reusable option.
| Specification | Details |
|---|---|
| Battery Type | Lithium (LiMnO₂) – Primary (non-rechargeable) |
| Nominal Voltage | 3.0 Volts |
| Capacity | Typically 1,400–1,700 mAh |
| Operating Temperature Range | –40°C to +70°C (–40°F to +158°F) |
| Diameter | Approximately 17.0 mm (0.67 inches) |
| Height | Approximately 34.5 mm (1.36 inches) |
| Weight | Around 16–18 grams |
| Shelf Life | Up to 10 years (depending on brand and storage conditions) |
| Chemistry | Lithium Manganese Dioxide (LiMnO₂) |
| Terminal Type | Button top (positive) and flat bottom (negative) |
| Rechargeable Version | RCR123 (Li-ion or LiFePO₄, 3.6–3.7V nominal) |
High Energy Density – Rechargeable CR123 batteries store a large amount of energy in a compact size.
Stable Voltage Output – They provide a consistent 3V output throughout most of their discharge cycle.
Long Shelf Life – Last up to 10 years.
Wide Operating Temperature Range – These batteries perform well in temperatures from –40°C to +70°C.
Lightweight and Compact Design – They are small and light. This feacture makes them easy to use in portable and space-constrained devices.
Leak-Resistant Construction – 3v CR123 lithium battery utilizes robust sealing technology.
High-Drain Capability – They can deliver bursts of high current.
Low Self-Discharge Rate – CR123 3v battery loses very little charge over time.
Available in Rechargeable Variants – Rechargeable versions (RCR123) offer an eco-friendly alternative for frequent users.
CR123 lithium ion batteries have various names and model numbers, depending on the brand and application.
Many of these equivalents share similar dimensions, voltage, and chemistry. Therefore, they are suitable replacements in most devices.
The most common and direct equivalent to the CR123. Both have the same size (17 mm × 34.5 mm), voltage (3V), and lithium chemistry (LiMnO₂). In most cases, CR123 and CR123A are interchangeable and perform identically.
This is another equivalent designation used by some manufacturers. The “17335” refers to the approximate dimensions (17 mm diameter × 33.5 mm length). This makes it physically and electrically the same as CR123 3v battery.
This is the rechargeable version of the CR123 battery. It typically operates at 3.6V or 3.7V, slightly higher than the standard 3V of non-rechargeable CR123 cells.
While it can replace CR123 in some devices, always confirm that your equipment supports the higher voltage to prevent damage.
A larger, rechargeable lithium-ion cell with a nominal voltage of 3.6V–3.7V. While it uses similar chemistry, it is much bigger (18 mm × 65 mm) and not interchangeable with CR123 batteries. It is commonly used in laptops, flashlights, and power tools.
A smaller 3V lithium battery (15.6 mm × 27 mm). Though it shares the same voltage as the CR123, its size and capacity differ.
This means it cannot directly replace a CR123 battery. CR2 batteries are typically used in compact cameras and rangefinders.
| Battery Type | Voltage | Capacity (mAh) | Size (Diameter × Length) |
|---|---|---|---|
| CR123 | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
| CR123A | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
| CR17335 | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 33.5 mm |
| RCR123A (16340) | 3.6–3.7 V | 500–800 mAh | 16.0 mm × 34.0 mm |
| 18650 | 3.6–3.7 V | 2,200–3,500 mAh | 18.0 mm × 65.0 mm |
| CR2 | 3.0 V | 750–850 mAh | 15.6 mm × 27.0 mm |
CR123, CR123A, and CR17335 are direct non-rechargeable equivalents. If your device supports 3.6–3.7V rechargeable batteries, RCR123A (16340) can be used. Despite similar voltage ratings, 18650 and CR2 are physically incompatible.
CR123 batteries are a top choice for LED flashlights and tactical lights used by law enforcement, military, and outdoor enthusiasts.
Many digital cameras, film cameras, and camera flashes use CR123 batteries.
Motion detectors, wireless alarms, sirens, and smart locks use CR123 batteries.
CR123 batteries are commonly found in medical instruments. Such as glucose monitors, infusion pumps, and portable diagnostic tools.
Many IoT and smart home devices—including sensors, thermostats, and wireless cameras use CR123 batteries for long-term, maintenance-free operation.
Due to their durability and ability to perform in extreme temperatures, CR123 batteries are used in night vision devices, laser sights, and rangefinders.
CR123 batteries power remote sensors, meters, and remote control devices in industrial settings. Because these devices require stable voltage and long operational life.
CR123A batteries are high-performance lithium batteries. They deliver stable, long-lasting power for a wide range of electronic devices.
The lithium battery is about 17 mm in diameter and 34.5 mm in length, and a nominal voltage of 3 volts. These batteries utilize lithium manganese dioxide (LiMnO₂) chemistry.
They provides high energy density, low self-discharge, and excellent performance in extreme temperatures. Therefore, they are ideal for high-drain devices such as cameras, flashlights, alarm systems, and medical instruments.
Although the names “CR123” and “CR123A” are often interchangeably, CR123A is the official IEC designation. Manufacturers like Energizer (EL123A), Duracell (DL123A), and Panasonic (CR123A) produce versions of the same battery with slightly different labels.
| Specification | Details |
|---|---|
| Battery Type | Lithium (LiMnO₂) – Primary (non-rechargeable) |
| Nominal Voltage | 3.0 Volts |
| Capacity | Typically 1,400–1,700 mAh |
| Operating Temperature Range | –40°C to +70°C (–40°F to +158°F) |
| Diameter | Approximately 17.0 mm (0.67 inches) |
| Height | Approximately 34.5 mm (1.36 inches) |
| Weight | Around 16–18 grams |
| Shelf Life | Up to 10 years (depending on brand and storage) |
| Chemistry | Lithium Manganese Dioxide (LiMnO₂) |
| Terminal Type | Button top (positive) and flat bottom (negative) |
| Rechargeable Equivalent | RCR123A (Li-ion, 3.6–3.7V nominal) |
Despite their compact size, CR123A batteries have high energy density. Even in high-drain devices like flashlights and cameras,they provide long operating times.
They maintain a stable 3-volt discharge throughout most of their life cycle. The devices perform reliably without sudden drops in power.
With a shelf life of up to 10 years, CR123A batteries are ideal for emergency equipment, security systems, and backup power applications.
They function efficiently in temperatures ranging from –40°C to +70°C. This makes them suitable for outdoor, industrial, and tactical use.
Their small, cylindrical design makes them easy to carry and install in portable devices.
CR123A batteries are built with robust seals and corrosion-resistant materials. This minimizes the risk of leakage and damage to sensitive electronics.
Designed for power-drain devices, these batteries can handle rapid discharge rates. So they are ideal for LED flashlights, digital cameras, and wireless security sensors.
Even after years of storage, they retain most of their charge.
For users looking a sustainable and cost-effective option, RCR123A (rechargeable) versions are available.
CR123A batteries have several equivalent names and sizes depending on the manufacturer or chemistry type. Here are the most common equivalents and their characteristics:
The most direct equivalent of the CR123A battery. Both have the same dimensions (17 mm × 34.5 mm) and operate at 3.0 volts. Additionally, they provide the same performance and reliability. Therefore, they are completely interchangeable.
Another standard lithium battery, with nearly the same size (17 mm × 33.5 mm) and 3.0V output. Labels may vary between manufacturers, but they are a perfect replacement for the CR123A.
A rechargeable lithium-ion version of the CR123A. It provides 3.6–3.7 volts and has a lower capacity (500–800 mAh). If the device supports rechargeable cells, it can replace CR123A batteries.
Duracell proprietary model number for its CR123A lithium battery. It offers the same voltage, capacity, and size, making it a direct replacement for CR123A.
Energizer’s equivalent model for the CR123A. It has the same specifications and performance. Therefore, it is fully interchangeable with CR123A batteries in any compatible device.
| Battery Model | Nominal Voltage | Capacity (mAh) | Size (Diameter × Length) |
|---|---|---|---|
| CR123A | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
| CR123 | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
| CR17335 | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 33.5 mm |
| 16340 (RCR123A) | 3.6–3.7 V | 500–800 mAh | 16.0 mm × 34.0 mm |
| DL123A | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
| EL123A | 3.0 V | 1,400–1,700 mAh | 17.0 mm × 34.5 mm |
All CR123A, CR123, CR17335, DL123A, and EL123A batteries share the same voltage and dimensions. They are fully interchangeable.
16340 (RCR123A) is rechargeable and has a higher voltage (3.6–3.7V). So it can only be used in devices that support rechargeable lithium cells.
CR123A batteries are the preferred choice for LED flashlights, tactical torches, and weapon-mounted lights.
Many digital, film cameras, and camera flashes rely on CR123A batteries for consistent power and fast flash recycling.
CR123A batteries are commonly used in motion detectors, smoke alarms, smart locks, and wireless security sensors.
Thermostats, door/window sensors, and wireless cameras often use CR123A batteries for maintenance-free, long-term operation.
These batteries power portable medical instruments, such as glucose meters, infusion pumps, and diagnostic tools.
In industrial environments, CR123A batteries are used in data loggers, sensors, and measurement tools.
While CR123 and CR123A batteries are interchangeable, there are differences based on manufacturer labeling and specific products. Below is a detailed comparison:
| Features | CR123 | CR123A |
|---|---|---|
| Voltage | Provides 3 volts steady power. | Also provides 3 volts steady power. |
| Capacity | Holds 1,300mAh to 1,700mAh. | Typically holds about 1,550mAh. |
| Size | 34.5mm long, 17mm wide. | Similar dimensions, slightly shorter. |
| Shelf Life | Lasts up to 10 years stored. | Also lasts up to 10 years stored. |
| Compatibility | Works in many devices. | Compatible with most devices needing CR123. |
| Cost | Generally cheaper option. | Costs more but lasts longer. |
| Temperature Range | Operates in -20°C to 70°C. | Handles -40°C to 70°C better. |
| Common Uses | Used in flashlights and cameras. | Preferred for tactical and high-drain devices. |
| Naming Convention Explained | CR123 focuses on the battery's size and shape. | CR123A highlights its chemistry and features. The "A" in CR123A might mean small changes in chemistry. |
In most cases, CR123 and CR123A batteries are often the same. Here are the key similarities:
Both batteries have the same dimensions—17 mm in diameter and 34.5 mm in length. This allows them to fit the same devices without any modification.
They both provide a nominal voltage of 3.0 volts, ensuring stable and reliable power output for high-drain devices.
CR123 and CR123A batteries use lithium manganese dioxide (LiMnO₂) chemistry. This offers high energy density, low self-discharge, and long life.
Both have a long shelf life of up to 10 years. They are suitable for emergency devices and long-term storage.
They perform reliably in extreme conditions, typically from –40°C to +70°C. They are ideal for outdoor, industrial, or tactical use.
Both deliver stable voltage and high current output. Thereofore, they are suitable for cameras, flashlights, security systems, and other high-performance electronics.
They feature built-in protection against leakage and short circuits, ensuring safe operation in consumer and professional devices.
CR123 and CR123A are fully interchangeable. This means both battery can be used in a device labeled as the other without affecting performance or safety.
Yes. Essentially, CR123 and CR123A batteries are the same type of battery.
Both have same size (17 mm × 34.5 mm), nominal voltage (3.0V), and lithium manganese dioxide (LiMnO₂) chemistry. This means they deliver the same power and performance in compatible devices.
The difference between them is naming convention: some manufacturers label the battery as CR123, while others use CR123A. Functionally, they are fully interchangeable. Both can be used in devices designed for the other without affecting performance or safety.
CR123 and CR123A are the same battery with different names, but the same specifications, chemistry, and applications.
Yes, CR123 and CR123A batteries are fully interchangeable.
They share the same size (17 mm × 34.5 mm), nominal voltage (3.0V), and lithium manganese dioxide (LiMnO₂) chemistry. This allows them to fit and function in the same devices without any issues.
If your flashlight requires a CR123A, putting in a CR123 will work perfectly. If your smoke detector asks for a CR123, a CR123A will perform the same function.
Whether your device specifies CR123 or CR123A, you can safely use them. Their performance, voltage output, and safety will remain consistent.
Choosing between CR123 and CR123A batteries is simple because they are essentially the same battery. Here’s a step-by-step guide to help you decide:
Look at the manufacturer’s recommendation. Some devices list CR123, while others list CR123A. While they are interchangeable, following the device manual will ensure compliance with warranty or safety guidelines.
Different brands may label the battery differently. Duracell uses DL123A, Energizer uses EL123A, and others may use CR123. Choose a reputable brand for consistent performance, safety, and longer shelf life.
If your device supports rechargeable batteries, you may select RCR123A (16340). Note that rechargeable versions have a slightly higher voltage (3.6–3.7V). Always confirm compatibility.
For emergency devices or long-term storage, standard CR123/CR123A batteries are ideal choice. They have a shelf life of up to 10 years. For frequently used or high-power devices, rechargeable batteries may be more cost-effective.
CR123 and CR123A batteries are priced similarly. Consider availability in your region or retailer. If you require multiple devices to ensure consistent performance, buy in packs.
While CR123 and CR123A batteries are interchangeably, understanding their specifications and intended applications can help you make a more informed decision.
In most cases, both batteries share the same size, voltage, and compatibility. This means they can typically substitute for each other without issue.
However, checking your device’s manufacturer recommendations is always wise to ensure optimal performance and safety.
Whether you’re powering a camera, flashlight, or alarm system, knowing the differences between CR123 and CR123A batteries allows you to choose the most efficient and reliable power source for your equipment.
Essentially, CR123 and CR123A batteries are the same. The "A" in CR123A is a manufacturer's label variation. Therefore, CR123 and CR123A are just brand differences.
Yes, CR123 and CR123A batteries are fully interchangeable. Essentially, they are the same type of battery.
Because CR123 batteries use advanced lithium chemistry and have high energy density. Additionally, they are suitable for high-drain, high-performance devices. These lead to high manufacturing costs.
16650 battery. Its length is twice the length of the CR123A battery. So, it's a direct replacement for 2 CR123A batteries.
Yes, the Energizer 123 Lithium battery is a brand-name version of the CR123A standard battery. Both use a lithium/manganese dioxide chemistry and have a nominal voltage of 3V.
Duracell DL123A or Duracell CR123A. They all share the same 3V lithium-manganese dioxide chemistry and dimensions.
Another names include 123A, DL123A, EL123A, SF123A, and 16340.
A few hours to several years. However, the shelf life of a CR123A battery depends entirely on the device's power consumption.
Use a multimeter set to DCV 20 to measure its voltage. The reading is about 3.2V to 3.3V, battery is new, fully charged. If the reading is below 3.0V, the battery is dead and should be replaced.
CR123A batteries are suitable for high-drain devices like flashlights, cameras, and tactical gear. As well as in security systems, smart devices, and some medical equipment.
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1.4V-Capable Temperature Sensor with I2C/SMBus Interface with One-Shot