LR54 batteries, also known as AG-10 or 189 batteries, are small, button-style batteries that are commonly used in a variety of small electronic devices. They are often used in devices that require a small, lightweight battery, such as toys, watches, and calculators. It appears that the LED Taibolo LED kits use LR54 batteries as a power source. These batteries are known for their long shelf life and reliable performance, making them a good choice for devices that are used frequently or over extended periods of time. If you are using the LED Taibolo LED kits, it is a good idea to keep a supply of LR54 batteries on hand so that you can easily replace them when needed..