Terrorist Airliner Explosion: Maybe Just a Battery?

Could it be possible that the government and media are jumping to an embarrassing conclusion, along with potential racial profiling here? I am an electrical engineer by profession for over 30 years, and the description of the explosion sounds just like a faulty battery on a personal electronic device (PED). If the plane was just starting it's descent, it could be he was stowing his device at the time of the explosion (turning it on/off, cabin pressure fluctuations, etc.), a more likely time for the battery to explode if it were faulty. These PED battery explosions are typically "small" and limited in area, consistent with the reported events.'

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