The ornamental design for a batterypackholder, as shown and described.
FIG. 1 is an isometric view of a battery pack holder of our new design.
FIG. 2 is a top view of the holder shown in FIG. 1.
FIG. 3 is a bottom view of the holder shown in FIG. 1.
FIG. 4 is a front view of the holder shown in FIG. 1.
FIG. 5 is a rear view of the holder shown in FIG. 1.
FIG. 6 is a left side view of the holder shown in FIG. 1; and,
FIG. 7 is a right side view of the holder shown in FIG. 1.
The dashed broken lines in FIGS. 2 and 3 are for the purpose of illustrating portions of the article that form no part of the claimed design. The shade lines shown in the figures illustrate character and contour, and not surface ornamentation.