A battery terminal for an implantable battery is described. The battery terminal includes a foil stack, first and second side elements, and a weld joint coupling the foil stack and the side elements. The side elements define a varying height profile and a greatest height adjacent an inner surface of the side element in contact with the foil stack. Each element may define a height profile along the width that tapers toward an outer surface, biasing mass of the element close to the foil stack.