Lithium batteries are much more likely to experience uncontrolled high temperatures that can lead to fires if they are damaged, exposed to excessive heat, overcharged or have manufacturing flaws.

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"Heat-related illness such as heat exhaustion or heat stroke are a real threat, " the National Weather Service said in issuing an excessive heat warning through Sunday for eastern Missouri, including St.

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Further, the couple frequently reminds their staff to watch out for signs of possible heat exhaustion, such as nausea, excessive sweating or no sweating at all.

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