NiMH typically shoot lower ROF simply because of the chemistry of NiMH. NiCADs are better at burst power. When you get up into the higher MAHs this is less of an issue as NiMH begins to approach NiCAD performance, but at the lower MAHs the difference is noticable.
If it is significant it could also be that the battery is f*cked, however, a NiMH and NiMH comparison would better to make than to NiCAD.
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