1. Can't help here....
2. Need to know what BL setup you're running, some limit voltage more than others.
3. You need a lipo capable charger and a lipo balancer, prefereably a charger with a already balancer builtin. Charger selection is impacted by how big your lipos will be and how many cells.

Quality lipo - anything made with Enerland or Kokam lipo cells, some include PolyQuest, Flightpower, Trakpower, Orion, NeuEnergy, Hyperion. I am also a believer in you get what you pay for with batts - I have some NeuEnergy and getting ready to buy a pr of PolyQuest. They're expensive, but they deliver! Check out -

http://www.rclipos.com/

This lipo section will give you a little background, was posted by another, but worth a read -

http://www.batteryuniversity.com/index.htm