You need the charger that comes with Futaba TX:
http://www.rcplanet.com/ProductDetai...BC19B4&click=3
The DSX radio can really only be charged with a trickle charger like the one above, I tried charging my son's with a charger specifically designed for quick charging TX and RX batteries and I kept getting a "voltage too high" message on the charger's display. For $20 the Futaba will work fine and is compatible with many TX jacks EXCEPT JR ( it will fit a JR but the polarity is different). Of couse always check the TX to make sure the pin is (+ )and the ring is (-). The above charger will work with Hitec, Airtronics, Cen radios, Associated radios, some HPI and OFNA RTR radios etc.