Thus the question, just how much salt in a bucket, one gallon, of water to soak a very swollen LiPo battery?  I had the wife buy a 1.4 pound can of Morton's salt . I poured one  pound of the salt into the bucket. Dumped the battery and now it sits forlorn and under water in the back yard.  This is the same battery that was in the profile that caught fire in the air. A small portion of the plastic wrap melted, but nothing extreme, and the battery has made about 10 or 12 flights. But today it barely fit into the battery "box" on my Profile Cavalier, so I decided to dump it.
How long in the water and does actually do anything if the battery has not been "opened" by cuts, etc and can it then be tossed in with regular trash??

I just Googled "disposal of lipo batteries" and came up with this from our friends at Thunderpower

http://thunderpowerrc.com/PDF/DISPOSAL-OF-LIPO-BATTERIES.pdf

According to What I've read on the RC Forum, saltwater is not the best way to dispose of a lipo and is also considered ineffective. They claim the best way is to make a discharger out of an automotive bulb (back up works well). Just add a connector to a standard socket and plug it in. I put my batteries on a concrete slab behind my house away from everything and in 24 hours it is at zero voltage and harmless. Then I just put it out with the regular trash.

I found the safest and best way to make a lipo safe is;

1st. Fully charge the battery.

2nd. Place battery (on its side) on a cement surface well away from flamable material.

3rd. Belt lipo with axe, making sure not to cut it completely in half.

4th. Watch and enjoy the fireworks.

Make sure you see all the cells flare up. If you don't, belt it again!! 

Great fun!!!!

Dan, 
DONT PUNCTURE IT EVEN WITH A WOODEN STICK!!!!!! There must be 100 threads on RcGroups on how to properly dispose of a lipo. I do the light bulb method, outside away from everything till its DEAD  DEAD  DEAD!!!!

William