Designed specifically for Yaesu / Vertex brand handheld radios, the FNB-V57 battery pack is composed of Nickel Cadmium, which allows it to hold a sizable charge of up to 1000 mAh and can produce up to 7.2 Volts of power. The battery pack works with the following Yaesu / Vertex models: VX120, VX130, VX150, VX160, VX180, VX210, VX210A, VX400, VX800, VXA150, VXA170, VXA200, VXA210.