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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.