14500 batteries are a type of rechargeable lithium-ion battery that are similar in size and shape to a standard AA battery. The number "14500" refers to the battery's physical dimensions: 14mm in diameter and 50mm in length. While they have a lower capacity than larger lithium-ion batteries like the 18650 and 21700, 14500 batteries are popular due to their compact size and versatility. They are commonly used in applications such as flashlights, electronic toys, and portable electronics. Due to their similarities to AA batteries, 14500 batteries can often be used as a replacement in devices designed for AA batteries, providing a rechargeable alternative. However, it is important to note that they have a higher voltage than AA batteries (3.7V nominal), so using them in place of AA batteries can cause damage to the device if not handled properly. As with other lithium-ion batteries, 14500 batteries require specialized chargers to ensure safe and proper charging. They are also available in different chemistries, including high-drain and low-drain, depending on the intended application.