Belkin Residential Gateway Battery Backup Power Supply UPS 12V-DC BU3DC001
This does include the battery itself.Tested and powers on; this power supply plugs into particular units with a particular plug, so please know what you are buying before purchasing: This plugs into the wall and then feeds power to a Belkin gateway during outages.
Used, good condition tested for power and powers on with no issues-- see generally ship same or next businessday depending on the time of your order!