What is the central idea of once he had perfected the battery, he began to think of ways to improve the lives of the people in his community. one day a week, the government electricity would turn on in the village. the villagers had electricity to power up devices and use their simple light bulb only four times a month. the rest of the month, they were in the dark. kelvin decided to make a bigger battery. he made a generator to power the homes in the village. now, they only have to turn on the generators to enjoy the benefits of electric power.