The ornamental design for a batcaddy, as shown and described.
FIG. 1 is an enlarged top, front, left side perspective view of a bat caddy showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a left side elevational view thereof, the right side elevational view being a mirror image thereof.
The baseball bat and ball holder shown in dashed lines in FIG. 1 is included for the purpose of illustrating environment and forms no part of the claimed design.