The ornamental design for an electrickettlebase, as shown and described.
FIG. 1 is a perspective view an electric kettle base showing my new design;
FIG. 2 is a front elevational view of the electric kettle base of FIG. 1;
FIG. 3 is a rear elevational view of the electric kettle base of FIG. 1;
FIG. 4 is a right side elevational view of the electric kettle base of FIG. 1;
FIG. 5 is a left side elevational view of the electric kettle base of FIG. 1;
FIG. 6 is a top plan view of the electric kettle base of FIG. 1; and,
FIG. 7 is a bottom plan view of the electric kettle base of FIG. 1.
The broken lines in the drawing views represent unclaimed portions of an electric kettle base which are included for the purpose of illustrating unclaimed environment only, and forms no part of the claimed design.