The ER34615/WIRES is a lithium-ion battery pack manufactured by Ultralife. It is composed of two ER34615 cells, each of which are 3.6 volts and come in a 4.2Ah capacity. The ER34615/WIRES is designed to be used in a range of electronics, such as portable medical equipment, military radios, and GPS units. This product has been tested and certified to UL 1642, CSA 22.2, IEC 62133, and UN 38.3 requirements. The battery pack is widely used in high-end products due to its excellent power-to-weight ratio, reliability, and high capacity.