A watt-hour is a unit of electrical energy measurement equivalent to a power consumption of one watt for one hour. It has a unit symbol of W⋅h or Wh that is often found on small batteries to help you determine how long it can power the equipment or devices based on their power rating in watts.
A Li-ion polymer battery inside a Google Pixel 4 phone has a capacity of 2,800 milliamp-hours or 10.78 watt-hours. Theoretically, the battery could power:
- A one-watt led bulb for 10.78 hours.
- A five-watt light bulb for 2.156 hours.
- A ten-watt portable mini fan for 1.078 hours.