The ornamental design for a large batterypack for powered air purifying respirator (PAPR), as shown and described.
FIG. 1 is a front perspective view showing the new design for a large battery pack for powered air purifying respirator (PAPR);
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left view thereof; and,
FIG. 7 is a right view thereof.
The broken line showing forms no part of the claimed design, and the shading is provided to illustrate contour only and is not an indication of texture, gloss, etc.