If you want to keep the SS light and get about 10 -12 minutes of flight time, a 7 cell (8.4V), 650-700 mAh 2/3 AA battery is a good bet. It's what I used for the first year of flying my SS.

Here's a link to the battery (KAN700AA). Look down the page. KAN has a good reputation.

http://www.cheapbatterypacks.com/?si...ells&chem=NIMH

Price is pretty good and I've always received my packs within a week of ordering them (may not be realistic at this time of year, though).

Here's a link to the battery that I used, though it's no longer available at Tower. That shape worked well for me.

http://www3.towerhobbies.com/cgi-bin...?&I=LXGBN0&P=7