Device for Power Storage

FIG. 1 is a front, top, right perspective view of a device for power storage, in accordance with an embodiment of my new design; FIG. 2 is a front view of the device for power storage of FIG. 1 ; FIG. 3 is a rear view of the device for power storage of FIG. 1 ; FIG. 4 is a right view of the device for power storage of FIG. 1 ; FIG. 5 is a left view of the device for power storage of FIG. 1 ; FIG. 6 is a top view of the device for power storage of FIG. 1 ; and, FIG. 7 is a bottom view of the device for power storage of FIG. 1 . The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines of equal length dashes in the drawings are for illustrative purposes, depict environmental subject matter, and form no part of the claimed design. The device for power storage can be multifunctional. For example, the device for power storage can be used as a power bank and/or handwarmer.