In electronics, a battery is a combination of two or more electrochemical cells which store chemical energy which can be converted into electrical energy.

The nickel-cadmium battery (commonly abbreviated NiCd or NiCad and pronounced "nye-cad") is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes.

Alkaline batteries are a type of disposable battery dependent upon the reaction between zinc and manganese (IV) oxide (Zn/MnO₂). The alkaline battery gets its name because it has an alkaline electrolyte of potassium hydroxide, as opposed to the acidic electrolyte of the zinc-carbon batteries which are offered in the same nominal voltages and physical size

A nickel-metal hydride battery, abbreviated NiMH, is a type of rechargeable battery similar to a nickel-cadmium (NiCd) battery but using a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd batteries, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size NiCd. However, compared to the lithium-ion battery, the volumetric energy density is lower and self-discharge is higher.

Lithium-ion batteries (sometimes abbreviated Li-ion batteries) are a type of rechargeable battery in which a lithium ion moves between the anode and cathode. The lithium ion moves from the anode to the cathode during discharge and from the cathode to the anode when charging.

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