Im confused by this.
I always thought puffing of a battery was a good thing akin to how a bodybuilder puts on muscle. Puffing is a sign your batteries are working hard and are growing bigger to adapt to the load. Ive often felt I get more power, longer run times faster charging the more puffy it gets.
Obviously you need to factor this into your build to allow ( like a cg shift) battery swell. Most guys don't allow for this or even take advantage of the benifits of a MASSIVE lipo swell.
Forget 5S or even 6S : a puffy 4S will kill any piped .75 for power delivery. Its like a supercharged electric setup.
You guys dont know the 1st thing about Lipos
LIPO stands for Let It Puff OK
For every 10% of atmospheric swell I gain 10% more power reserve resonance to used anytime after the landing but before the next manouver.