Thats a 50watt charger and all you really need is a supply with mor ethan about 60watts. Something like this would work -

http://www3.towerhobbies.com/cgi-bin...?&I=LXYGX9&P=7


Check and see if the connection to the charger looks like what you need. If you have a spare laptop power supply lying around and could get it connected, that'd prob work as well.