Jeti also has some 2100 mah and 2700mah 2S Lipo receiver packs in addition to the Lithium Ion packs they sell.
http://www.espritmodel.com/jeti-rece...v-li-poly.aspx I've used them in a couple of airplanes and they seem to be quite good. For a plane that I wanted to use 5000 mah 2S pack I used pulse.