Here is a kit with all the cables needed to build a battery to have a parallel connection. The length of the cables is for attaching the extra battery to the upper part of the frame.
The connectors are XT30 and the thickness of the wires is 16AWG.
All the cables needed to build your own range kit for e.g. Xiaomi where the connectors fit with the original connectors for the motherboard and battery.
What is included:
1x parallel connection 140cm and 7cm