i would take it to an open spaced vented location with just concrete all around, then douse it with petrol and throw a match on it, much like the bomb disposal deal with bombs (they blow em) this way your local bin man won't get annoyed for lighting his truck on fire...
i could be totally wrong i've never used them, but i wouldn't knife these before destroying them...
Really wish i could use these batteries but no way in hell am i keeping a fire hazard in my home, sucks cause lithiums are just too damn
complicated,expensive,tedious,geeky & dependant on too much bells & whistles... I would think you're putting your
life in your own hands using these which is why i suspect it's got the name
lifepo4...
http://www.youtube.com/watch?v=M6xVZzZES-A
Yeah these look totally safe...