18650 rechargeable battery lithium 3.7v 3500mah

　　Specifications of Rechargeable Lithium - Batteries

　　Rechargeable lithium - batteries come in a variety of specifications to meet different application requirements.

　　Cell Chemistry

　　There are several types of lithium - battery chemistries, each with its own characteristics. Lithium - ion (Li - ion) is the most common. It offers a good balance of energy density, cycle life, and cost. Lithium - polymer (Li - Po) batteries are also popular, especially in applications where a flexible or thin form - factor is required. They are similar to Li - ion batteries but use a polymer electrolyte instead of a liquid one. Lithium - iron - phosphate (LiFePO4) batteries are known for their high safety, long cycle life, and good thermal stability. They are often used in applications such as electric vehicles and energy storage systems. Each chemistry has different voltage profiles, capacity retention over cycles, and performance characteristics, so the choice of chemistry depends on the specific application needs.

　　Physical Dimensions

　　Rechargeable lithium - batteries come in various physical dimensions. Common sizes include cylindrical cells like the 18650 (18 mm in diameter and 65 mm in length), which is widely used in laptops, flashlights, and some electric vehicles. Button - cell lithium - batteries are small and flat, typically used in small electronic devices such as watches, calculators, and some small sensors. Prismatic lithium - battery packs are also available, with different sizes and shapes to fit into various devices. The physical dimensions not only determine the form - factor of the device but also affect the battery's capacity and power - handling capabilities. Larger - sized batteries generally have higher capacities.

　　Energy Density

　　Energy density is an important specification, defined as the amount of energy stored per unit mass or volume of the battery. High - energy - density batteries can store more energy in a smaller or lighter package. For example, modern lithium - ion batteries have relatively high energy densities, allowing for long - lasting power in portable devices. In applications like electric vehicles, high - energy - density batteries are crucial to increase the driving range. However, increasing the energy density also poses challenges in terms of safety and cost. Some advanced battery chemistries are being developed to further improve the energy density while maintaining safety and cost - effectiveness.

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