Modular battery pack apparatus, systems, and methods including viral data and/or code transfer

A battery enclosure, comprising:

• an outer casing assembly;
• a thermally conductive structural housing element configured to house a battery assembly in an interior volume, the thermally conductive structural housing element including an opening for placement of the battery assembly within the inner volume;
• a lid element configured to cover the opening in the thermally conductive structural housing element and mechanically strengthen the thermally conductive structural housing element, the lid element including a circuit element disposed to electrically couple the battery cell to a battery-powered device;
• and
• a vent assembly configured to allow exchange of gases to and from the interior volume and restrict entry of water into the interior volume;
• wherein the lid element comprises a printed circuit board (PCB) assembly.