Nickel-Metal Hydride (NiMH) and Nickel-Zinc (NiZn) batteries, which fall under the category of nickel metal batteries, also encompass Nickel-Cadmium (NiCd) batteries.

The nominal voltage of typical cells is 1.2V (NiMH, NiCd) and 1.6V (NiZn), which were excellent battery power solutions before the advent of lithium-ion batteries.

Due to its lower nominal voltage compared to lithium-ion batteries, nickel series battery power solutions are still used 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 specifications for cadmium-nickel batteries (sets) for railway passenger cars, GB/T 28867 for rectangular sealed cadmium-nickel single batteries with alkaline or other non-acid electrolytes, GB/T22084-2 on metal hydride nickel batteries, GB/T22084-1 on nickel-cadmium batteries, GB/T2947-2 on nickel batteries and chargers, and GB/T15142 on cadmium-nickel single batteries.

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