Three months ago, consumers across the globe got an unpleasant surprised when their Samsung Galaxy Note 7 phone blew up. Miraculously, no reports of major injuries were made and everyone quickly received a replacement phone. However, not soon after they received their replacements, a second recall had to be made as several from the second push were reported to be defective as well. After two embarrassing failures for what was supposed to be a flagship for the South Korean mobile company, the line was cancelled altogether in what many are calling one of the biggest tech failures in history that cost the tech company nearly 5 billion dollars and perhaps, the trust of their customers.

Finally, in a press conference last week, Samsung mobile chief Koh Dong-jin apologized on behalf of the company and announced what they believed to be what caused some of the phones to overheat.

“We feel strong responsibility for not identifying the battery design issue before launching the note 7… from now on our first priorities will be product qualities and customer safety.”

Koh went on to reveal that after an extensive investigation both by the company and independent researches in South Korea, they discovered what caused the phones to spontaneously combust. According to Samsung, the batteries are what caused the phones to catch fire, not the internal structure of the handset or software like some had presumed. In the first release of the phones, a design flaw in some cases triggered a meet between positive and negative electrodes, staring a fire. In the replacement batteries which were sent from a different supplier, there were welding problems which led to a short circuit and caused the copper to melt.

To ensure that this doesn’t happen again, Samsung has developed an eight-point battery check and formed a group of third party advisors. Though they have announced that their next release of the Galaxy Note 8 has had its software and hardware checked over through this process, many expect that the release announced for April or May could be delayed.

[Via Reuters]