In principle, silver (per)manganate, AgMnO4, represents a substantial cathodic charge source for electrochemical storage, but exhibits poor charge transfer. This study presents a novel hydroxide activation of AgMnO4, as well as an active composite cathode of Fe(VI) (super iron) and AgMnO4. The Fe(VI) composite cathode contains BaFeO4. AgMnO4, and KOH. Evidence relates the hydroxide activation to a reaction intermediate, K2MnO4/AgO, which preserves the intrinsic AgMnO4 high charge capacity. Also presented is the high discharge energies resulting from these cathodic phenomena in alkaline primary batteries. Cathodes included either AgMnO4 alone, 67% AgMnO4 with 33% KOH, or a composite of 39% AgMnO4, 12%, KOH. and 49% BaFeO4 (barium super iron). Probed with a conventional alkaline zinc anode in a AAA cylindrical configuration, AgMnO4 alone discharged to 0.8 Wh at 75 Omega, a value low compared to a conventional alkaline MnO2 discharge of 1.5 Wh. The KOH or Fe(VI) activated cathode cells each discharge to 2.0 W yielding a 2.5-fold increase in discharge capacity compared to the simple AgMnO4 cathode.