The newest version of these has an added circuit to ensure that power does not flow until it's properly connected to an appropriate three-pin connector.
There is a mechanical work around, i.e a 'cheat', but it involves using the connectors that you've now cut off.
See this post:
180 Brick (2/9/2022) | gunrunnerjohn
Good luck. This may not be easy to undo.
Mike