If you want the Futaba packs, either one of theses depending on if you want the flat or square pack.

http://www3.towerhobbies.com/cgi-bin...?&I=LXH333&P=0
http://www3.towerhobbies.com/cgi-bin...?&I=LXH335&P=0

And for the transmitter.

http://www3.towerhobbies.com/cgi-bin...?&I=LXH348&P=0

These packs will work the best with your wall charger with 50ma charge on both ports. Charge them overnight, at least 14 to 16 hours, and work the transmitter and servo's till the servo's slow down, then leave the transmitter on till you run it down. It will beep, or the LED will change colors. Then charger them again overnight and you should be good to go.

Read the manual and it should tell you how to tell when the transmitter is running low.