"The battery in the camera is running low, so you'll have to find the spare batteries I've hidden around the factory. They are all used batteries, with just a little bit of charge left. To ensure four hours of continuous power, you'll need about eight." Hao Assistant announced the supplementary rules with a smile.,Hao the assistant still smiling, waved to the five people, and then left through the door.,I suppose the rules about finding batteries are meant to keep them active in the factory. You can't just hide in a corner for four hours and call it a day, can you。