The Chinese have built their battery factories in the driest humidity climate areas in China. Some peoples heads will explode at this thought, but if you do an internet search of how to salvage puffing lipo's there's a guy who just punches a hole in the individual cells, squeezes out the "gas" and coats the puncture with some adhesive that looks like Goop. My limited experience is that batteries that are stored for long periods fully charged are most likely to puff. If you don't plan on flying for a couple of weeks use your smart charger to bring the battery voltage to the storage level.