buy the dry cell holder from tower and buy some 2700 or 2800 AA nimh... that is what i did..
http://www2.towerhobbies.com/cgi-bin...?&I=LXEYM7&P=7
or go with team muchmore's li-on pack for the 3pk
http://teammuchmore.com/product_info...roducts_id=311