Check out this websight and look under the batteries and chargers section. It shuold give you alot of answers. Lipo's are already changing the face of larger prop models and smaller one's as well. Some flight times are exceeding what glow models can do that including edf's. It is however very expensive still and just starting to come of age. It shouldnt be long before it really takes a hold in the market. Good luck in your future projects.
http://www.rcgroups.com/forums/index.php