A method of forming a flexible microbattery and battery is provided. The method including: forming a film with a cavity therein; applying a first outer flexible substrate to a first side of the film; applying a second outer flexible substrate to a second opposite side of the film, wherein a cathode, an anode, a separator and an electrolyte are located within the cavity and the film provides a first seal about the cathode, the anode, the separator and the electrolyte and wherein the first seal extends between the first outer flexible substrate and the second outer flexible substrate; cutting a trench through the first outer flexible substrate, the film and the second outer flexible substrate after the first seal is formed; disposing a curable material in the trench; curing the curable material to provide a second seal, wherein the first seal is located between the cavity and the second seal.