One embodiment of the present subject matter includes a stack of substantially planar electrodes including at least a first and second anode layer, and a plurality of cathode layers, a case in which the stack is disposed and to which the plurality of cathode layers is connected, a first feedthrough disposed through the case and connected to the first anode and a second feedthrough disposed through the case and connected to the second anode, wherein a first capacitor including the first anode layer and a second capacitor including the second anode layer are electrically isolated.