There is a lot to explain with Lipos and I tend to get off topic so here you go:
http://www.rcgroups.com/forums/showthread.php?t=209187
http://youtu.be/yJ-QyHiiqUI
Hope these help!
And here is a decent guide on how to take care of your batteries:
http://www.fantomracing.com/lipo-instructions.php