Top 5 Cylindrical Lithium Battery Models and Specifications Explained

Cylindrical Lithium Battery Models showing 14500, 18650, 21700, and 26650 for medical, industrial, and consumer applications

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

ModelNominal Voltage (V)Nominal Capacity (mAh)Diameter (mm)Height (mm)Application Areas
145003.78001450Instruments, consumer electronics
186503.72000–350018±0.265±2.0Medical equipment, robots
185003.6800–150018±0.250±0.2Security communication, rail transit
266503.23200–350026.265.6Power tools, energy storage, robots
217003.63000–48002170Digital devices, power tools
32650 (32700)3.24500–650032.4±0.370.5±0.2Backup 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?
Visit our Battery Products Page for detailed specifications and OEM solutions.


External Reference


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