The report said the official investigation report, which would be released on 23 January, had come to this conclusion.
The Note7 was released in August 2016 and the first reports of exploding devices came in September. Samsung then issued a worldwide recall, but after even the replacements started exploding and catching fire, the company called a halt to production.
Since then, there has been a long wait for the company to make an official pronouncement on the reason behind the failure of the device.
The two engineers, chief executive Anna Shedletsky and chief technology officer Sam Weiss found that after acquiring a Note7 and taking it apart — with a fire extinguisher kept nearby — they had found that the design of the Note7 compressed the battery even during normal operation.
Samsung did not react to the reports on this investigation, despite the fact that it was widely reported in the tech press.
In the Reuters report, Bryan Ma, a Singapore-based IDC analyst, was quoted as saying: "They've got to make sure they come clean and they've got to reassure buyers as to why this won't happen again."
Sources said the company's investigators had been able to reproduce the fires and they could not be explained by hardware design or software issues.