Two fairly old Metabo cordless drills (Kirton IP12)

Two Metabo cordless drills, one is 9.6 volts, the other is 12 volts. There are two chargers which can both charge either 9.6v or 12v batteries. The 9.6v drill has two NiCd batteries which don't hold their charge well. The 12v drill has one NiCd battery which doesn't hold charge well and one NiMh battery which is OK but not a perfect fit in the drill (it fits the chargers OK). Some web research may well find NiMh batteries to fit.