skarredghost review: https://skarredghost.com/2021/03/31/tundra-labs-hdk-steamvr/

Connector to Tundra HDK:
Official rec: https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/2-2328724-5/9565581
Claude rec: https://www.digikey.com/en/products/detail/molex/5025982593/4141908
Alt: https://www.digikey.com/en/products/detail/panasonic-electric-works/AYF332535A/6049535

Battery connector: https://www.digikey.com/en/products/detail/jst-sales-america-inc/ACHR-03V-S/1647784
Wires for it: https://www.digikey.com/en/products/detail/jst-sales-america-inc/ASACHSACH28W152/6009446