Reason(s) why Samsung Note 7 phones caught fire

Its no news that samsung discontinued the production of Samsung Note 7 last year due to the fact
that it always overheat and catches fire. After an in-depth investigations, Samsung Electronics today announced the cause of the Note7 incidents and measures to prevent a recurrence during a press conference held in Seoul.
According to DJ Koh, President of Mobile Communications Business, Samsung Electronics, the incidents were caused by the battery cell and no outlying piece of hardware and software. “We provided the target for the battery specifications for the innovative Note7, and we are taking responsibility for our failure to ultimately identify and verify the issues arising out of battery design and manufacturing process prior to the launch of the Note7,” he said in a statement to Android Central.
Samsung Note 7: Why it happened
via: Samsung mobileSamsung mobile
Incredible, such slight abnormality could cause them such havoc, hope it is not repeated again.
No idear please