18650 batteries are commonly used in various electronic devices and are a popular choice for video doorbells due to their compact size, high energy density, and rechargeable capabilities. These batteries are used to power the video doorbell, which typically requires a steady supply of power to operate continuously. When selecting 18650 batteries for a video doorbell, it is important to consider the battery's capacity, discharge rate, and voltage, as well as compatibility with the doorbell's specifications. High-quality 18650 batteries can provide long-lasting power to ensure reliable performance of video doorbells, helping to enhance home security and convenience.