Electric Accumulator

1. Accumulator, electric 1 . 1 is a front elevation of an electric accumulator showing the new design; 1 . 2 is a front perspective view thereof; 1 . 3 is a first side elevation view thereof; 1 . 4 is a back elevation view thereof; 1 . 5 is a second side elevation view thereof; 1 . 6 is a bottom plan view thereof; and 1 . 7 is a top plan view thereof. The portions of the design shown in broken lines form no part of the claimed design.