
Cylindrical Lithium Battery Models Overview
Cylindrical lithium batteries are among the most widely used rechargeable batteries today, known for their stable structure, high energy density, and excellent safety performance.
According to IEC61960 standards, cylindrical lithium battery model names follow a specific rule that combines letters and numbers to describe their composition and size.
How Cylindrical Lithium Battery Models Are Named
The model name consists of three letters and five digits, such as ICR18650. Here’s what each part means:
- I — indicates a built-in lithium-ion battery
- L — means lithium metal or alloy electrode
- Second letter — shows the positive electrode material:
- C = Cobalt
- N = Nickel
- M = Manganese
- V = Vanadium
- R — means cylindrical shape
- Five digits — represent size: the first two indicate diameter (mm), and the last three indicate height (mm)
✅ Example:
ICR18650 = Lithium-ion (Cobalt) cylindrical battery, 18mm in diameter and 65mm in height.
Common Cylindrical Lithium Battery Models and Specifications
Model | Nominal Voltage (V) | Nominal Capacity (mAh) | Diameter (mm) | Height (mm) | Application Areas |
---|---|---|---|---|---|
14500 | 3.7 | 800 | 14 | 50 | Instruments, consumer electronics |
18650 | 3.7 | 2000–3500 | 18±0.2 | 65±2.0 | Medical equipment, robots |
18500 | 3.6 | 800–1500 | 18±0.2 | 50±0.2 | Security communication, rail transit |
26650 | 3.2 | 3200–3500 | 26.2 | 65.6 | Power tools, energy storage, robots |
21700 | 3.6 | 3000–4800 | 21 | 70 | Digital devices, power tools |
32650 (32700) | 3.2 | 4500–6500 | 32.4±0.3 | 70.5±0.2 | Backup power, instruments, special equipment |
Understanding Battery Voltage and Discharge Rate
The nominal voltage (V) represents the average voltage during discharge — for example, 3.6V or 3.7V is typical.
The C-rate measures the discharge rate or speed per unit time:
- 1C = Full discharge in 1 hour
- 0.2C = Full discharge in 5 hours
Higher C-rates indicate faster discharge and are common in power tools or robotic applications.
Applications of Cylindrical Lithium Battery Models
Cylindrical lithium batteries are widely used in:
- Medical equipment (portable ventilators, diagnostic tools)
- Industrial robots and automation systems
- Energy storage and backup power
- Consumer electronics such as cameras and LED flashlights
💡 Looking for reliable 18650 or 21700 lithium battery packs?
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External Reference
- Learn more about IEC61960 Battery Standards on IEC Official Website.
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