I THINK the battery is the same style as is used in the current airtronics RD6000... this looks like the right one...

http://www2.towerhobbies.com/cgi-bin...?&I=LXFE02&P=0

...but you would have to add a connector. The connector is the same as an old style(black) airtronics servo lead I think.... or clip the one off the old pack and use that...

As for a charger, you might be able to get one of those universal DC chargers with all the different tips at some place like Radio Shack...although this might work....

http://www2.towerhobbies.com/cgi-bin...?&I=LXHCE6&P=0

Although the idea of sending it in to Airtronics and asking them to have a look at it might be the best option... I too have sent a radio in to them for work and had it back in just under 3 weeks(door-to-door)...and that was after being sent surface and across a border!