The ornamental design for a puck-shaped charging device, as shown and described.
FIG. 1 is a perspective view of the puck-shaped charging device;
FIG. 2 is a front view of the puck-shaped charging device;
FIG. 3 is a rear view of the puck-shaped charging device;
FIG. 4 is a first side view of the puck-shaped charging device;
FIG. 5 is a second side view of the puck-shaped charging device;
FIG. 6 is a top view of the puck-shaped charging device; and,
FIG. 7 is a bottom view of the puck-shaped charging device.
The broken lines shown in FIGS. 1, 3, 4, 5, 6, and 7 are included for the purpose of illustrating portions of the puck-shaped charging device that form no part of the claimed design.