hi,

best bet is to recycle them at your local retail store,
target, walmart, home depot, lowes, etc.

you'll need special charger(s) for these batteries,
otherwise they can overheat and safety vent opens
and or cell can rupture (explode is also possible)

better idea is to use common Nicke Hydride
NiMh batteries available at above retailers.

be safe, do more research on lithium battery technology.

lion dude..