What to do with an extra Shark base?

Is there anything useful to do with an extra Shark base? (When we did a warranty replacement about a year ago, we mailed back the vacuum as instructed, keeping the base on the assumption\ they'd just send us the robot replacement, but they sent us another base as well.) As far as I can tell, there's no way to set up another map on another floor of the house, but I hate to just throw away such a big chunk of tech.

Edit: It's the "AI Ultra" self-emptying model, if that matters.