brizmaker/Shutterstock Once upon a time, computers were gigantic installations that filled up several rooms, and scientists thought computers would only get larger from there. Instead, computers shrank. Yes, gigantic supercomputers are some of the most powerful calculation machines on the planet, but laptops allowed people to take their computers on the go. As long as they have a viable power source, that is. All laptops run on lithium-ion batteries, which offer several hours of life before they...