Puffed Lipo - Suggestions?

[rawfuls]

Well I have 2 Turnigy 2S 7.4V 5000mAh packs that have been puffed for awhile, but recently, got a bit more, fat and plump lately.

Very weird thing is, is that it's been barely used! I rarely ran it because I hated logging the logs and such, these are the logs:

http://i53.photobucket.com/albums/g6...000mAhLogs.jpg

If you can't tell, I rarely ran them.

It's been puffing for awhile, but now it's getting to the point where I'm starting to get worried.

I want to make some fireworks tomorrow (Labor Day!), and was thinking about popping it with a BB gun...
Make one go poof, and the other one the same, or poke it with a very long (and heavy!) sharp pole (uhh, forgot what's it's called.. )

I'm just worried I'm gonna catch something on fire, or.... damage something or.... make it smell like poop.

Any other suggestions?
I may also just be lame and toss it in a bucket of salt water and watch it erode and not blow up.

Anyways, here they are in all their glory