About 4 years old with ~1 year's worth of use. It's been in storage for the last 2 years so can't say how good the battery is but it seems ok (tested for about 10 minutes) but also can be used plugged in.
Item description: https://a.co/im135yE
Oontz speaker (Green Lake/Roosevelt)
This offer has been gifted to someone and is no longer available.