I have 2 protek's. One is a life and the other a lipo. I bought them both march 2012. I always put the lipo in storage mode if not using for a week or so. The life pack is recommended to be stored at full charge. I put them in a baggy and put them in the butter storage tray in the fridge. No puffing out of either of them. Maybe you got a bad one? I haven't heard any bad reports about protek's. I would buy protek receiver packs any day.