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Nickel metal hydride batteries recharge fewer times than NiCad and they perform very poorly in cold temperatures. Nickel metal hydride batteries recharge fewer times than NiCad and they perform very poorly in cold temperatures. Although NiMH batteries don't suffer from the memory effect that NiCd's have, they do have a less severe "lazy effect." The lazy effect is a weaker version of the memory effect. The lazy effect results from the crystallization of a portion of the nickel. Like the memory effect, the lazy effect prevents full use of the capacity in a rechargeable battery; both effects, however, can be avoided by using chargers with a discharge function. [[Image:lazyeffect.gif]]