The Galaxy Note 7 was hailed as Samsung’s super phone for 2017. Top of the line features – and a top of the line price tag – made it a seriously premium phone. At $880 (AT&T) buyers should have expected a seamless, wonderful phone. That was the case until a report of an exploding Galaxy Note 7 came in. And then another one, and another one. Samsung confirmed that there were more than 140 cases of exploding Note 7 phones, which prompted the tech giant to recall the phone across the globe. As an additional precaution, major carriers sent out software updates to limit use of the phone, including stopping the ability to charge.

Since the recall, Samsung has been in talks with many firms investigating what went wrong. After nearly four months of research, a conclusion has been reached.

There were actually two batteries used in design of the Note 7. The initial battery’s issue was that the negative electrode was deflecting in the upper right corner, leading the two to touch and in turn causing the batteries to explode.

Samsung found a different supplier for the second battery, which had all new issues of it’s own. When welding the parts of the battery together, they went too deep, which caused the separator to have a hole in it. A hole in the battery meant that the positive and negative electrodes touched, resulting in a failed battery.

The company has learned from its mistake, and is introducing a new 8-point battery checklist for each smartphone. The test includes visual inspection, X-ray, and disassembling the battery to make sure everything was put together properly, above all else. Samsung says that they’re committed to making their devices safer than ever before.

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