FBA-23BA : 2xAA Alkaline battery Case for Yaesu & Vertex radios. Replaces original FBA-23. Load with 2 x AA Alkaline batteries for handy instant power! Case has a built-in PCB that converts 3VDC (from batteries) into 4.5VDC to power the radio. Fits VX-5R, VX-6R, VX-7R, VXA-700, VXA-710, FTA-720; Standard Horizon HX-471.