Man I have to be the luckiest guy on the planet regarding Lipos (not much else really). Got around 30 Zippy, Turnigy and Rhino packs from Hobbyking and not one puffed or dead cell on arrival. The only lipo I ruined was the one I accidentally left plugged in my mini Revo for a whole week. Doh!!!

Anyway to keep an eye on what state my lipos are in I use one of these things. CLICK It's a great little tool and makes life a lot easier when you are out in the field. It gives you readings of each cell and then (for those that are mathematically challenged) gives a reading for the whole pack. It's pretty accurate too. Just love it. Much easier than dragging my multimeter with me to the track.