Power Bank

1 . 1 is a top, front, right perspective view of a power bank, showing our new design;

1 . 2 is a bottom, rear and left perspective view thereof;

1 . 3 is a front elevation view thereof;

1 . 4 is a rear elevation view thereof;

1 . 5 is a left elevation view thereof;

1 . 6 is a right elevation view thereof;

1 . 7 is a top plan view thereof;

1 . 8 is a bottom plan view thereof; and,

1 . 9 is a third perspective view thereof.

The broken lines are included to show features that form no part of the claimed design.