According to China's telecom experts, Xiang Ligang, she might wear a replica, not the original from Apple.
"Artificial fillers sometimes be a shortcut. Capacitor and the quality of the protective circuit may not be appropriate, and this may cause the capacitor strike and sends a 220 volt battery directly to the phone," said Ligang when the media interviewed CCTV.
Ailun Ma, a China Southern Airlines flight attendant, died in his home on July 11, 2013. Earlier reports said Ma Ailun iPhone 5 to use the phone. However, the results of the investigation said that the mobile phone is used is the iPhone 4 because the sides are made of stainless steel.
Another possibility, according to Ligang, a battery charger is used does not meet the standard electrical voltage in China. It may be that the device is intended for users in Hong Kong, Taiwan, or Japan.
"Hong Kong, Taiwan, and Japan, all using 110 volt electrical voltage. Meanwhile, Mainland China using 220 volts. If a battery charger is made only to accommodate 110 volts, it will cause damage or excess burden," he added.
Xiang statement is not entirely accurate because the Hong Kong using a standard 220 volt electrical voltage, although 120 volt outlet are provided at many hotels. Meanwhile, Japan using a standard 100 volt electrical voltage.
Ligang argues, electric current from a battery charger devices overload will make the phone so hot. This can damage the circuit on the inside and cause the device can not be used.
In the case of Ma Ailun, iPhone 4 so that the evidence can still be operated normally despite the burns on the back and sides. Meanwhile, other evidence such as a USB data cable and the charger is still intact.
So far the police are still investigating. Apple spokesman has expressed his condolences. Company promised to investigate the case and to cooperate with the local police.