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There are several "dry cell" rechargeable battery types including nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel metal hydride (NiMH) and lithium-ion (Li-ion). NiMH has replaced NiCd in most applications due to its higher capacity, but NiCd remains in use in power tools, two-way radios, and medical equipment. NiZn is a new technology that is not yet well established commercially.Standard refers to standard consumer sizes, such as A, AA, AAA, C, D, and 9v square batteries.A more disambiguous title, "''Rechargable Dry Cell Batteries of Standard Consumer Sizes''." These are mostly for portable electronics and other small consumer electrically powered products.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]]* Powerex Imedion - Pre-Charged and Ready-to-use Rechargeable Batteries retain up to 85% of charge after one year of storage. [[Image:comparethemrechargebatts.gif]]