Normally we would replace the Tamiya connector with some 4mm male "corally" plugs, like these -
http://www.rcracinguk.com/index.php?...oducts_id=1733 (widely available from various manufacturers). The Tamiya connector can't handle very high currents and often melts.
But, if you don't want to do the soldering job, you can buy adaptors like these -
http://www.hpieurope.com/piw.php?lang=en&partNo=101961