A silver borate system with the composition 0.710.75AgI : 025AgCll: 0.3[ yAg,O : (Iy)B,O,l has been prepared in which the host salt used is a "quenched [0.75AgI : 0.25AgCl] mixed system" instead of the commonly used host AgI. Three sample preparation procedures were adopted: (a) molten sample at -650°C dropped into neutral liquid bath at -10°C; (b) molten sample in silica ampule at -650°C left in air to cool by itself; (c) molten sample left in furnace and allowed to come to room temperature in -24 h. The highest room temperature conductivity u= 2.23 X lo-* S cm-' was obtained for the sample composition: 0.7[0.75AgI: 0.25AgCI]: 0.3[0.833Ag,O: O.l67B,O,] prepared by procedure "a" and referred to as an "optimal composition". The DTA, XRD (including linewidth measurement for determining Scherrer length/crystallite sire), temperature dependence of o (by Impedence Spectroscopy), mobility Jo (by Transient Ionic Current technique), and number of charge carriers n are also reported. Solid state batteries with the cell configuration: Ag/ 0.7[0.75AgI: 0.25AgCll: 0.3[0.833Ag20: 0.167B20s]/ (C + I,) were fabricated and the discharge characteristics were studied.