safe disposal info for lipos:
If your pack is dead, safely discharge it with a low draw device such as an unloaded motor and then a light bulb.. when the cells read 0 volts, strip the head off, twist the wires together and you can safely toss it in your household garbage.. but ONLY if it's 0 volts. Not completely draining it can result in spark when you short the wires and lead to a fire. If you're completely unsure if it's safe to run a device off the pack, skip to the next step.
To be absolutely sure, you can leave the pack in a salt water solution for a couple days (or weeks if you are leaving charge in it) and then toss it in the household garbage.
I've verified this disposal method with several R/C hobby shops, it's the safest and easiest way to dispose of it. If you are still unsure, take it to a battery recycler.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.