This invention discloses a facile activation method to enable the operation of polymer-based solid-state batteries at room temperature (RT), including: 1) applying a heat treatment to cell components and/or whole cell at the temperatures of 40-150 degrees C. 2) applying a pressure of 20-200 psi to cell components and/or whole cell for >15 min. 3) applying an ultrasound treatment to cell components and/or whole cell for <60 min. 4) applying a microwave treatment to cell components and/or whole cell for <60 min. 5) applying a combined treatment to solid-state battery using any mix of 1) to 4).