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Ultra Max AAA 350mAh NiMH Rechargeable Batteries in Packs of 4 are commonly considered to have a lower environmental impact than NiCd batteries, due to absence of toxic cadmium.
A nickel-metal hydride cell, abbreviated NiMH, is a type of secondary electrochemical cell similar to nickel hydrogen cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH cell can have two to three times the capacity of an equivalent size nickel-cadmium battery. However, compared to the lithium-ion cell, the volumetric energy density is lower and self-discharge is higher.
Common AAA cells (microlight-size) NiMH batteries have nominal charge capacities ranging from 300 mAh to 1000 mAh at 1.2 V, usually measured at a discharge rate of 0.2×C per hour. Useful discharge capacity is a decreasing function of the discharge rate, but up to a rate of around 1×C (full discharge in one hour), it does not differ significantly from the nominal capacity.
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