I have a QuadroPower 6200 4 Cell lipo battery that after it powers the CS8 to "undervoltage" minimum discharge, it gets fairly warm and puffs up slightly .... like there is trapped air in the plastic wrapping, but just on the top and bottom. When I lightly press the puffy part it feels like air but still has a solid feel when you press enough to feel the cells . The sides of the battery are not puffy at all. It still takes a full charge at about 16.7 v in about 45 minutes. Is this a sign of the battery failing. I have other 6200 batteries that do not puff up. Any one know what that might be.