A control module for an electrical stimulation system, the control module comprising: an electronics housing; an electronic subassembly (358, 458) disposed within the electronics housing; a power source housing disposed adjacent to, and in contact with, the electronics housing; a power source (312, 464) disposed within the power source housing; and an interface comprising at least one first non-conductive feedthrough block (580, 580a) and at least one interface feedthrough pin extending through each of the at least one first non-conductive feedthrough block, wherein the at least one first non-conductive feedthrough block is attached to one or more of the electronics housing or the power source housing, wherein the at least one interface feedthrough pin is electrically coupled to the power source and the electronic subassembly to provide power from the power source to the electronic subassembly; characterized by one or more connector assemblies (456a, 456b) extending laterally from the electronics housing, each of the one or more connector assemblies comprising a connector lumen (481a, 481b) configured and arranged to receive a lead, a plurality of connector contacts arranged along the connector lumen and in electrical communication with the electronic subassembly, and a plurality of connector conductors electrically coupled to the connector contacts; and a plurality of feedthrough pins extending through the electronics housing, wherein the conductors of the one or more connector assemblies are electrically coupled to the feedthrough pins and the feedthrough pins are electrically coupled to the electronic subassembly. an electronics housing; an electronic subassembly (358, 458) disposed within the electronics housing; a power source housing disposed adjacent to, and in contact with, the electronics housing; a power source (312, 464) disposed within the power source housing; and an interface comprising at least one first non-conductive feedthrough block (580, 580a) and at least one interface feedthrough pin extending through each of the at least one first non-conductive feedthrough block, wherein the at least one first non-conductive feedthrough block is attached to one or more of the electronics housing or the power source housing, wherein the at least one interface feedthrough pin is electrically coupled to the power source and the electronic subassembly to provide power from the power source to the electronic subassembly; characterized by one or more connector assemblies (456a, 456b) extending laterally from the electronics housing, each of the one or more connector assemblies comprising a connector lumen (481a, 481b) configured and arranged to receive a lead, a plurality of connector contacts arranged along the connector lumen and in electrical communication with the electronic subassembly, and a plurality of connector conductors electrically coupled to the connector contacts; and a connector lumen (481a, 481b) configured and arranged to receive a lead, a plurality of connector contacts arranged along the connector lumen and in electrical communication with the electronic subassembly, and a plurality of connector conductors electrically coupled to the connector contacts; and a plurality of feedthrough pins extending through the electronics housing, wherein the conductors of the one or more connector assemblies are electrically coupled to the feedthrough pins and the feedthrough pins are electrically coupled to the electronic subassembly.