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NiCads (nickel-cadmium rechargables) of certain types develop a memory. therefore, it's best to fully discharge them.
I've heard a number EE's chime in on the subject of so-called "battery memory" and I think that, in the final analysis, it's just an urban legend that was perpetuated early on by some misguided marketdroids.
Deep discharging a rechargable battery is not good. Also note that some batteries hold their charge while sitting on the shelf better than others. I think NiCd's lose their charge relatively quickly if you don't use 'em.