Most Lipo battery chargers have a Storage mode. If you dont plan on using them in the next few days it is always best to bring your batteries down or up to storage voltage (approx 3.8v per cell). LiPo C Rating Explained: What 30C, 100C, and 130C Really Mean ChinaHobbyLine Is this the result of keeping Lipo C in the refrigerator? : r Peptidesource This lipo bag fits perfectly in my ammo can. I think this makes for a pretty solid budget lipo storage solution. : r rccars Lipo Charging & Storage Bag Large Safe, Secure & Durable Helios RC LLC RVS LiPo Storage Bag