ORIGINAL: DBCherry
I'll recommend an 8 cell, 600AE NiCD pack as an inexpensive flight pack.
You will land before you have taken off! Use a 1700 as an absolute minimum, preferably a 2400. The Twinjet works fine on a 7 cell pack 8 is better but for 8 cells you need a more expensive step up charger, basic chargers will only properly charge a max of 7 cells. Step up chargers like the supernova are wll worth having for the future though, and can be used to charge your 8 cell Tx pack and so on.
H