Asus R506A - Manual (Page 16)

16 Notebook PC E-Manual
Bottom
NOTE: The bottom side may vary in appearance depending on model.
WARNING! The bottom of the Notebook PC can get very hot while
in use or while charging the battery pack. When working on your
Notebook PC, do not place it on surfaces that can block the vents.
IMPORTANT! Battery time varies by usage and by the specifications
for this Notebook PC. The battery pack cannot be disassembled.