Formation of lattice defects (factor defects/dislocations/grain barriers) is an unavoidable phenomenon that is related to nearly all synthesis strategies following rapid formation kinetics. Therefore, a polycrystalline thin movie of hybrid perovskite advanced for a solar cellular perpetually includes lattice defects. Similarly in a scientific fashion the use of ball mill grinding approach we've synthesized perovskite cloth, Methyl Ammonium Lead Iodide (MAPbI3) with one-of-a-kind ranges of crystal defects as probed through Positron Annihilation Spectroscopy (PAS) and applied to Fabricate Flexible Piezoelectric Nano Generators (FPENGs). Five units of MAPbI3 samples are prepared by ball mill grinding method with distinct grinding time (15m, 30m, 60m, 90m and 120m).