At first when I heard of the pottential dangers of Lipos I was scared away. Then I seen some videos on YouTube!!! In order to get anything close to a spectacular explosion or fire you pretty much have to do it intentionally! like plugging the thing into AC or holding a dead short, or direct 12V hook up, but nothing was instantanious that I seen, it all took several minutes. I'm sure that it is frowned upon but I have fallen asleep many times with mine hooked up to the charger. It just shuts down to a trickle charge and the balancer keeps pulling little bits of juice out of it, after 6 hours it was no more charged than normal with no ill effects!
On that note I say get an RC vehicle going first run it a couple times and see what happens. Compare run times with your other pack, or if running in series check and see how balanced everything stays. I wouldn't jump to any conclussions just yet, no need to waste your money shipping and Neu's time disecting it if it turns out to be nothing!
I ALSO PUFFED A 4S 5000 CRAPSAMPS PACK PRETTY GOOD BUIT AFTER I COOLED DOWN IT WENT BACK TO NORMAL AND IT WASN'T SQUISHY...SO I CHARGED IT AND BALANCED IT AND IT TOOK BACK 4700MAH AND HAS BEEN THE ONLY RELIABLE CRAPSAMPS PACK I'VE HAD... AND YES I'M STILL RUNNING IT IN MY 8IGHT WITH NO MORE PUFFING