British baker Warburtons has invented the world’s first battery-powered butter knife, which heats the dairy product to 41.8 degrees Celsius “after research found that is the optimum temperature to spread butter.” Pricing and availability have not yet been announced. Continue reading for a video, more pictures, and additional information.


The knife, designed by Warburtons, heats up to 41.8 degrees Celsius, powered by AA batteries in the handle – and melts the butter just enough to spread smoothly, without gouging holes in the bread. A button on the handle activates the battery-operated heating element and a flashing LED indicates it is on. The prototype can spread a slice of bread in 30 seconds – although it’s not clear when or if it will be released, or how much it will cost.