The incorporation of piezoelectric nanogenerator energy harvester and energy storage into one device allows the mechanical strain or energy to be directly stored as useable electrical energy and also provides a sustainable and maintenance-free power source. The intermediate step of conversion from mechanical piezoelectric to electricity and electricity to stored energy is done away with. The conventional separator is replaced with a piezoelectric material, which when compressed generates piezo-potential that drives electrode-active ions, to charge batteries or supercapacitors. This technology paves a way for the development of autonomous electronic devices. This hybrid system boycotts the energy that could have been lost in the external power-management circuits for a non-integrated system.