Although lithium batteries heat up quickly because of their structure, they have systems and circuits in place to prevent overheating, Nishijima said.

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He then sparked a small fire when he tried to heat it up quickly before it could disintegrate.

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Laboratory tests have shown that such events can prompt nearby cells to quickly heat up and result in a fierce, high-temperature fire engulfing the battery and anything nearby.

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Gas grills heat more quickly but still need time to come to temperature and for grates to hook up.

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