The effects of fluorination (F-treatment) of AB2-type Laves-phase Zr0.9Ti0.1V0.2Mn0.6Co0.1Ni1.1 (AB2) alloys and of mixing with untreated AB5-type MmNi3.68Co0.78Mn0.36Al0.28 (AB5) alloys on their charge–discharge characteristics were investigated. The F-treatment of the AB2 alloy greatly increased initial activation rate and discharge capacity and slightly improved high-rate dischargeability. The mixing of the F-treated AB2 alloy with untreated AB5 (<25 μm) alloy decreased somewhat the maximum discharge capacity compared to the fluorinated AB2 alloy but it greatly improved the high-rate dischargeability. In particular, the high-rate dischargeability for the AB2(F)AB5 (<25 μm) mixture positively deviated from the estimated values based on the maximum discharge capacity for both alloys and their content, suggesting that the AB5 alloy can work as a catalyst for dehydriding the AB2 alloy hydride besides as a hydrogen reservoir; a synergistic effect appeared by the mixing.