Old laptops are more energy efficient than old desktops. I use a few 10+ year old machines for various dedicated purposes. While most have no internal batteri

Old laptops are more energy efficient than old desktops. I use a few 10+ year old machines for various dedicated purposes. While most have no internal batteries, I plug them into a small $25 UPS and get the same brief power outage resilience that an internal battery would provide.