The Alien word stands for Unknown Manufacturer. It discharges continually which is different from the original one that is reliant to the power utilization of the phone. It may possibly burn your phone if you try to overcharge this kind of battery. Some people claim that it works after Charging Alien Battery message appears but don’t risk you phone neither your life buy the original one.
Thanks to my girlfriend for sharing me her Charging Alien Battery experience. LOL