The ornamental design for a batteryholderassembly, as shown and described.
FIG. 1 is a perspective view of the battery holder assembly.
FIG. 2 is a side view of the battery holder assembly.
FIG. 3 is a top view of the battery holder assembly.
FIG. 4 is a bottom view of the battery holder assembly.
FIG. 5 is a front view of the battery holder assembly; and,
FIG. 6 is a back view of the battery holder assembly.
The broken lines in the figures depict portions of the battery holder assembly and environmental subject matter which form no part of the claimed design.