Traxxas Wire harness, series batteryconnection:

Two mlae Traxxas plug and One female Plug.

Traxxas 2S Battery Harness for 2 Packs in series, 14AWGSilicone wire

The Traxxas's 2S harness allows you to connect two identicalpacks in series to effectively double the total voltage and cellcount. Use this to construct a larger voltage pack out of twomatching smaller packs.

Traxxas Wire harness, series battery connection