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This is a place to keep notes as I keep looking this up.
With the 40th anniversary on the way others may care as well.

Connectors are based off an AMPS design

Brand TE Connectivity AMP Connectors
Product Series Commercial MATE-N-LOK
Wire Gauges Supported 14-20

Associated 3740 3 pin battery connectors
Socket https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-480305-0/15642
Plug https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-480303-0/19287

Associated 3505 2 pin Edinger battery and motor
Socket https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-480319-0/15662
Plug https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-480318-0/15664


Connector pin and socket
Gold pins are available as well
https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/60620-1/15674
https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/60619-1/15676