Due to customer requests and some people having problems making adapter cables to use the Spot Welder with a Lipo battery, you can now get a XT90 adapter cable.
The cable has a XT90 male connector on one side and cable shoes with a 6mm hole for M6 screws on the other side. The length of the cable is only about 10cm to keep the resistance low and also to keep the shipping weight low, so international shipping does not become to expensive. These cables are crimped and soldered in my shop in germany.
A good compatible Lipo battery that has proven to work well with the Spot Welder is this one: Turnigy nano-tech 5000mah 3S 65~130C
You can use the adapter with or without the cases on the Spot Welder.
When using without the cases make sure you insulate the connection on the positive welding cable with some electrical tape.