Nickel-hydrogen, nickel-zinc batteries, which are a type of nickel metal battery, also include nickel-cadmium batteries.

The nominal voltage of the cells is typically 1.2V (Nickel-Metal Hydride, Nickel-Cadmium) and 1.6V (Nickel-Zinc), which were excellent battery power solutions prior to the introduction of lithium-ion batteries.

Due to its lower nominal voltage compared to lithium-ion batteries, nickel series battery power solutions are still adopted in some fields due to their performance.

Nickel metal series batteries comply with international electrical standards IEC62133-2, IEC61982-4, IEC60622, IEC61951-2, and IEC60623. Domestic relevant standards include SJ/T 11755 on Zinc-Nickel Batteries, SJ/T 10484 for Cadmium-Nickel Batteries (sets) used in railway passenger cars, GB/T 28867 for Batteries and Battery Assemblies with Alkaline or Other Non-Acid Electrolytes, Square Seal Cadmium-Nickel Single Cells, GB/T22084-2 for Metal Hydride Nickel Batteries, GB/T22084-1 for Nickel-Cadmium Batteries, GB/T2947-2 for Nickel Batteries and Chargers, and GB/T15142 for Cadmium-Nickel Single Cells.

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