This Yaesu Vertex FT51R replacement two way radio battery is 100% compatible with the Yaesu Vertex FT51R. Our batteries and accessories are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All batteries are tested for 100% quality control assurance. This Yaesu Vertex FT51R replacement two way radio battery includes a 1 year warranty to guarantee that it has no manufacturing defects.