Well the transformer came with the turnigy.. I wondered why it would not charge at 5A which I chose from the settings, it coult only output 4A. Turns out the transformer is only 12V 5A :D It became very hot durig charge too.
i came up with this solution too... Did you find a fitting... muuntaja.. transformer? somewhere? I found no matching solution. Each had a voltage too low or smth else...