UPS disposal options?

[Peter Dobratz]

I've got a PK Electronics BlackoutBuster (500VA UPS) with a spent
battery.  It looks like the company is also no longer existent.  I've
re-arranged my house and purged of non-essential electronics on ebay,
so this UPS is no longer needed (my 2 remaining UPSs are APC).

Is there a better way to dispose of this than the dumpster?

The Derry Transfer station accepts "Automobile, and Rechargeable
Nickel Cadmium batteries", but somehow I don't see them knowing what
to do with a UPS.

Thanks,
Peter