A method of fabricating a 3D porous electrode architecture comprises forming a microbattery template that includes (a) a lattice structure comprising a first lattice portion separated from a second lattice portion on a substrate, and (b) a solid structure on the substrate including a separating portion between the first and second lattice portions. Interstices of the first lattice portion are infiltrated with a first conductive material and interstices of the second lattice portion are infiltrated with a second conductive material. Each of the first and second conductive materials fill the interstices to reach a predetermined thickness on the substrate. The solid structure and the lattice structure are removed from the structure, thereby forming first and second conductive scaffolds comprising a porosity defined by the lattice structure and having a lateral size and shape defined by walls of the solid structure.