Fig. 1: Image of Single AA Standard NiHM Cell
Among all the secondary and rechargeable batteries that are available till date, NiMH batteries have been a popular name. The concept of commercialized hydrogen based rechargeable batteries was sought in 1960s but inability to store hydrogen in small cells was a big hindrance. In the mid 90s, technological achievement was unlocked and commercial production of NiMH batteries became possible.
A single AA standard NiMH cell gives 1.2V of outputs and can serve for an average of 2-3 years. The efficiency of these cells is around 70-80% and remains constant for a long period of time. This is a prominent reason for mass popularity of these cells.
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