A cylindrical cell is a type of rechargeable lithium-ion battery that features a compact, tubular shape. This design is characterized by a cylindrical metal casing that houses the battery components, including the electrodes, separator, and electrolyte. Cylindrical cells are a prevalent and well-established form factor in the battery industry.

These cells come in various sizes, with the most common being the 18650 size (18mm in diameter and 65mm in length). They are widely utilized in diverse applications such as laptops, power tools, cordless phones, and electric vehicles due to their durability, stability, and efficient heat dissipation. The cylindrical design allows for efficient stacking and thermal management, which contributes to their overall reliability and performance.

Cylindrical cells can provide a balance between energy density and ease of manufacturing, making them a popular choice for applications where space is limited. However, their cylindrical shape may lead to suboptimal space utilization in certain devices, and they might require additional engineering for proper heat dissipation in high-demand scenarios. It's essential to consider these factors when incorporating cylindrical cells into various technologies to ensure optimal performance and safety.