CR battery numbers are not random codes. They identify important information about a battery’s chemistry, size, and shape. Understanding these numbers helps engineers select the correct primary lithium battery for electronic devices, reducing compatibility issues during product development and mass production.
Most CR batteries use Li-MnO2 chemistry. The letter “C” indicates lithium manganese dioxide chemistry, while “R” represents a round cylindrical shape. The following numbers describe the approximate physical dimensions of the cell.
How to Read CR Battery Numbers
The first two digits usually represent the battery diameter, while the last two digits represent height.
For example:
| Battery Model | Diameter | Height | Nominal Voltage | Typical Application |
|---|---|---|---|---|
| CR123A | 17mm | 34.5mm | 3V | Security devices, cameras, medical equipment |
| CR2 | 15.6mm | 27mm | 3V | Compact electronics and sensors |
| CR14505 | 14mm | 50.5mm | 3V | AA-size battery applications |
The actual dimensions may vary slightly according to manufacturing standards and terminal designs. Product designers should always confirm mechanical drawings before final selection.
Choosing the Correct CR Battery Size
Battery selection requires more than matching the battery code. The device load profile determines whether a battery can deliver stable performance.
Key factors include:
- Operating voltage requirement
- Average current consumption
- Pulse current demand
- Device standby period
- Temperature range
- Available installation space
- Required service life
For example, wireless security equipment may require short bursts of high current during signal transmission. In this case, a battery with suitable pulse capability is more important than simply selecting the largest capacity.
The HOLITH CR123A 3V 1700mAh lithium battery is designed for applications requiring stable voltage output and reliable pulse performance. It provides 3V nominal voltage and 1700mAh capacity under specified testing conditions.
Manufacturing Quality Behind Battery Codes
Two batteries with the same CR number may show different performance depending on manufacturing control. Primary lithium battery production requires accurate control of lithium materials, manganese dioxide quality, separator thickness, electrolyte filling, sealing pressure, and aging time.
A professional manufacturer manages:
- Incoming material inspection
- Electrode preparation
- Automated cell assembly
- Precision sealing
- Voltage screening
- Internal resistance testing
- Discharge verification
- Batch traceability
Working directly with a manufacturer provides better visibility into production records and quality checkpoints. A trader may supply products, but usually cannot directly adjust manufacturing parameters or support technical improvements.
OEM and Bulk Project Checklist
Before selecting a CR battery for large-volume production, confirm:
| Item | Purpose |
|---|---|
| Battery datasheet | Verify electrical performance |
| Sample testing | Confirm real device compatibility |
| Terminal design | Ensure reliable connection |
| Temperature test | Validate environmental performance |
| Batch records | Maintain product traceability |
| Export documents | Support international shipment |
HOLITH supports OEM and ODM battery projects by evaluating battery dimensions, terminals, connectors, wires, labels, packaging, and application requirements. The company uses automated production and testing systems with reported annual output exceeding 40 million batteries.
For international projects, compliance documentation is also important. IEC 60086-4 defines safety requirements for primary lithium batteries, while UN 38.3 testing supports lithium battery transportation compliance.
Understanding CR battery numbers is the first step in selecting the correct cell. The final choice should combine size, electrical performance, manufacturing quality, and application conditions.