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Are NiMH batteries dangerous?

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NiMH are generally safe when punctured. Short-circuiting NiMH batteries can lead to rapid heating, which can result in melting and breaching of the case. Once the case is breached, the negative electrode, which is a metal-hydride (i.e. hydrogen-rich) will tend to burn. ... The biggest danger with NiMH is overcharging.Jun 19, 2017

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