The BAT-CR2025/TX-BL part of Tecxus is a lithium manganese dioxide battery. The batteries have a nominal voltage of 3V, a capacity of 2.5 mAh, and a size of 20.0 mm in diameter and 2.5 mm in height. They are used in a variety of electronic devices, including calculators, remote controls, and watches. This battery features a long shelf life and is reliable in extreme temperatures and extended use.