Yesterday one of my LiPos was slightly puffy/swollen (and unusually warm) at the end of my 6mn30s flight (Swift 620 SE 6S Combo)... I nearly bought a Zippy in the afternoon to replace it but just before paying I thought I'd give the LiPo a test before.
I tested it today and in fact it worked just fine. When I charged it, some cells were really low (3.3 V, usually I read more like 3.7) and it took time to charge, but it flew fine (I've reduced my timer to 5mn30s).
So the Zippy will wait.
What's the experience about puffy phenomenon? Can I continue safely, or should I discard the puffy cell (I have some left over cells from another identical LiPo that puffed out badly, much more than this one, like the cell had double width).