A little bit of puffing under heavy normal.  I sense you are getting a bit pissy in your responses, so let me clarify.  You stated you wrapped the LiPo in the shemagh to cool it.  This means either your shemagh was way below ambient temperature or you don't understand the definition of "cool".  For it to be cooler than the ambient temperature it would have either had to be pulled from a very cold location (like a freezer) or soaked in water.  If it was the later, that's probably the the absolute worst way to cool a battery I could possibly think of.  Not to mention LiPo's like to catch on fire when they've been abused.  So wrapping it in a flamable material and putting it in your car is probably the worst possible thing to do with it.  Lastly you don't really state what you think you were accomplishing by trying to cool the battery.  Batteries don't like cold any more than hot and cooling them doesn't fix anything.  Exposing the battery to freezing temps will damage it.

Your gun has given you two warning signs there's a problem that you've appeared to completely ignored.

1) Immediately blowing fuses.  If you are immediately blowing fuses, assuming you are using appropriate fuses, that means there's something wrong with your electrical system.  Typically a short.  You've bypassed this safety system and now your battery is taking the brunt of it.  By the sound of it, you've completely discharged your battery.  As stated previous, throw it away before you start a fire.

2) Clicking noise when pulling the trigger.  That means something is wrong and you should stop pulling the trigger.  Either the gearbox is locked up or the gun doesn't have enough power to turn it over.  You are running a stiff spring and the G&G motors are not that high of torque.

3) Rapidly draining batteries.  First off, you haven't told us how long the battery is lasting in a usable measurement.  "4 hours" tells us nothing.  Roughly how many shots are you getting out of it?  Secondly, if you know that battery typically lasts much longer than it did, that once again should cause concern.  If it uses a second battery in a much shorter timeframe than normal, that tells you almost certainly that the gun has an issue.

Yes, you need a tech.  But you also need to know the basics of how to care for your equipment, especially since you are running a gun "upgraded to the butt" with a LiPo battery.  You've basically built a race car and don't seem to know how to change the oil.

Lipos are no joke. If you over-drained your lipo, and it puffed up, throw it the f- away. You will burn down your house once you try to charge it.

http://www.youtube.com/watch?v=C5_-eBbDE0s

You sound like the kind of person who is best served by sticking to NiMH or NiCd batteries.