Traveling to Ancient Times, My AI Ran Out of Power

Others' golden fingers start invincible, but Chen Yu's golden fingers start with 91.2% Battery. Traveling to a strange ancient time, he only has a mobile phone with him. There is an AI in the mobile phone named Bai Ze - which contains almost all human knowledge before 2035. It can count money and food, can prevent cow diseases, and can recognize "this is not the earth" from a starry sky. But this cheat charges for talking: 0.2% For an hour of chatting; a few points for a major event; 3% for saving a life. So in this world where gunpowder is still just fireworks, Chen Yu first calculates the electricity bill before speaking, and makes a budget before taking action. During the day, he helps the village repair water dams and fight with lawsuit sticks, and at night he watches his mobile phone and listens to it calculate the way to survive tomorrow bit by bit. The battery is still draining bar by bar. If he wants to keep the only voice in the world that is willing to speak his mother tongue with him, he has only one way left: Build the world's first hydropower station.