Replacement Galaxy Note7 smartphones are safe, Samsung said in attempting to reassure customers this week after reports that consumers in South Korea, China and the U.S. said the replacement devices were running too hot.

“We would like to reassure everyone that the new Note7 phones are operating properly and pose no safety concerns,” the company said in a statement to USAToday on Thursday. “In normal conditions, all smartphones may experience temperature fluctuations.”

The fast charging of the Note7 devices and other devices using lithium-ion batteries could make them feel very hot, analysts said.

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