I've had my Phantom for almost two years now. I had a third party battery which didn't seem to last long, so I just chalked it up to a bad battery from the local (now out of business) hobby shop. My DJI phantom batteries all seemed to work well, until recently. I noticed all of them seemed to have minor swelling and don't give me more than about 6 minutes of flight time (only timed one of them) whereas before they gave me 12-14 minutes each. My question is, what is causing this swelling? Am I overcharging them? I can only think of one occasion where I might have let one charge overnight. I store them at room temp which is very cool. I do fly them until the Phantom blinks red, so maybe I'm draining them too much? Looking through similar questions I noticed people saying that you should store at 50%. I didn't fly too often over the past few months, could that be the issue? I'm using the charger that came with the Phantom kit, is it possible that it's old or damaged in some way? My most recent batteries are just over a year old now (a year and a month, to be exact) but it seemed to me that the power was starting to weaken a short time back. Sorry for the long thread, trying to add in as many factors as possible. I've been scouring through similar threads and not really finding the same question or issue. Is this just the life of the Lipo batteries? Is there something I can do to prevent this swelling? Again, it's very minor swelling but I do notice a power loss and diminished flight time. I googled the subject but mainly saw posts that you need to get new batteries and stop flying with swelled ones at once. Thanks in advance!