The ornamental design for an electrickettle, as shown and described.
1. Electric kettle
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
1.8 : Reference view of state of use
In reproduction 1.8, the broken lines illustrating a base depict environmental subject matter that forms no part of the claimed design. All other broken lines depict portions of the electric kettle that form no part of the cd. In reproductions 1.5, 1.7 and 1.8, the two broken lines at the top of the electric kettle and the area between them depict portions of the electric kettle that form no part of the claimed design.