These are replacement batteries for UB6120-F2 (D5778), YT-6120-F2, RT6120-F2, NPX-50, BP12-6-F2 and GP6120-F2. We supply only brand new, factory fresh, high quality batteries. We guarantee the best price and 100% compatibility with your Topaz 800 model. You must use the existing cables and hardware to connect your replacement ups batteries. The replacement sla batteries also include a minimum of one year warranty.