C902 Pushing down the Cliff

Yann Chengwu was startled by the sudden blackness. His first reaction was that the battery was out, but then he realized that it was not the case. He had charged the battery during the day. Besides, the battery would slowly dim down as the battery ran out of energy. It would not go out all of a sudden. Could it be that the battery was broken?

He cursed at his bad luck