I don’t want to dismiss the POSSIBLE danger when a LiPo battery “puffs” and caution is advised, but most LiPo batteries will out-gas at some point. This causes the swelling you see. Over the years I have used 2S thru 6S and series 5S to make a 10S packs. While not desired you will find the outgassing will happen for a variety of reasons - heat, discharging at to high a rate, overcharding, charging to fast, improper cooling during flight and other reasons I’m sure I’m forgetting. A puffed battery is not necessarily bad, it’s just vented gas for one of the above reasons, or other. In my main RC application, I use 6S 4500 35C batteries. I pull up to 80A with normal current being 40A using the throttle to control the planes speed (I’m not racing to see how fast I can fly, but trying to keep constant speed). I monitor airflow over the batteries and adjust air input volume and air exit volume, typically a 1:3 ratio (3 being the exit air volume). The ensures heat is not being trapped in the fuselage. With all these precautions I still get outgassing occasionally. The batteries still perform fine and I still use them, but at any indication of ill-regularity I retire the battery and do what the others state above. I have flown for a year or more with a puffed battery with good performance. You just need to watch it close and look for signs the battery is not performing normally. Monitor each cells voltage when the pack is fully charged (4.2v) and after a flight (the voltages should be very close to the same, let’s say 3.7 volts. If a cell is 3.5v and others are 3.7v don’t use that pack and discard as per above posts.
Good luck.
Ive had my Breeze for a year now. Loved it up until the battery wouldn’t charge. Putting it on the charger resulted in the “abnormal charging” blinking blue light. Bought a new battery. After about a month...same issue! Bought yet another one a couple weeks ago and couldn’t get it to charge even once. Out of the box it was blinking “abnormal charging”. Frustrated because Best Buy Geek Squad wouldn’t even look at the charger or the batteries, I bought a whole new Breeze on Amazon. It came in the other day. Damned if it didn’t have a charger with the same “abnormal charging” blinking light!! So, this morning I noticed that one of the 4 (yep, I now have 4) batteries is bulging! This could not be good!! I can’t seem to get a hold of anyone at Yuneec! Now what do I do????
