The China LR621 AG1 battery has several advantages that make it a popular choice for a variety of applications. One advantage is its small size and lightweight design, which makes it easy to carry and use in devices that require compact batteries. Another advantage is its long shelf life, as the battery can last for several years without losing its charge. Additionally, the LR621 AG1 battery is known for its reliable performance and ability to deliver a consistent power output over an extended period of time. It is also relatively inexpensive compared to other types of batteries, making it an economical choice for those on a budget. Overall, the China LR621 AG1 battery is a reliable and cost-effective option for a wide range of devices and applications.