A lithium-ion smartphone battery will take roughly 4 hours to reach a 100 percent charge from empty. Fortunately, the numbers tell a different story.Ī typical smartphone uses about 5 watts of electricity while charging when the device is plugged in but fully charged, that number drops close to zero. Modern smartphones' daily charging cycle and ever-nagging battery indicators imply heavy power use. I know desktop computers, game consoles, and cable boxes can inflate your power bill, but what about the little gadgets? I charge my phone every night.
