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Yeah I didnt do it to the Monster one I had for the same reason my mate is reluctant to do it to the SDC one, firstly theres a warranty issue if something doesnt go right and frys the battery, and more importantly it becomes a dubious item if you decide to sell as a complete kit later.
Im sure jaycar or someone could match the specs but out of the box should be a minelab brand plug, even a usb version, they could make it if they chose to, pretty poor they didnt.