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Why are there ventilation holes on the bottom of the Ni-MH battery packs?

April 26, 2017battery Ni-MH packs Ventilation

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Why are there ventilation holes on the bottom of the Ni-MH battery packs?

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One of the characteristics of Ni-MH batteries is that the battery temperature tends to rise during charging. To prevent a reduction in battery service life due to high temperatures, it is necessary to cool the battery during charging. For more information, visit the Home Ventilation Institute Web site at www.hvi.org.