Samsung finally could figure out the reason behind Galaxy Note 7 battery blunder. A report on The Wall Street Journal shows the investigation details which the company was going through third-party analyst firms from last couple of months. The investigation blames “irregularly sized” batteries and its manufacturing faults for the widespread faults of the Galaxy Note 7. The South Korean tech giant will officially reveal its results on Monday. For investigation, Samsung hired three independent “quality-control and supply-chain analysis” firms. These firms listed two separate faults affected the Note 7 and pointed finger mainly to the battery size of the device. The first fault is related to Galaxy Note 7, that used batteries made by Samsung subsidiary Samsung SDI. The Galaxy Note 7 had received largely positive reviews and was off to a strong start before this overheating issue. These batteries created problems like it didn’t fit inside the phone properly, which led to overheating and, explosions in the major cases. Second fault was related to manufacturing, which is still not clear although the full report can shed light behind the actual reason. On Monday, Samsung has to conclude its investigation of its flagship smartphone, and need to determine the main culprit. Seeing that the battery was the part of the handset and major reason for explosion, this comes as little surprise.