The ornamental design for an electricbattery, as shown and described.
1. Electric battery
1.1 : Back
1.2 : Bottom
1.3 : Left
1.4 : Top
1.5 : Front
1.6 : Right
1.7 : Profile view
The broken line showing of the elements on the bottom end of the electric battery, visible in reproductions 1.2, 1.6 and 1.7 illustrate portions of the electric battery that form no part of claimed design. The broken line showing of the bicycle seat illustrates the environment of the claimed design and forms not part thereof.