The packs are 7.4V and 740mAh.

I went to another target that had a different set for a different RC flying thing. It is 7.4V and 450mAh. This one has built in circiut protection. If I'm not mistaken, they might be the same cells that atomicmods sells with their lipo kit for entirely too much money.

Both sets were 7.50 and include chargers. Right now, I have two of each; though I will probably be buying the rest of the 450mAh packs they have left.