will this 6 cell monster pack for rc18mt that comes from cheapbatteries.com
http://www.cheapbatterypacks.com/main.asp?pgid=packs&pid=CAR&sid=353887&ctype=
first one on list, will it work with this charger ?

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXXG87&P=7

if not what charger need?

3.5 amps may be a bit high for those batteries
Any charger that is adjustable from 2 amps to 5 amps and in NiMH compatable should suit you nicely