Tenn 

These are used, but seem to be in good working condition.   We have test run them here. They are the better Lithium Ion version!

Here's some info from the internet:

Clean small, congested areas in forward and reverse with this highly maneuverable battery-operated scrubber.
Eliminate the hazards of cords with the Tennant T1 Battery Walk-Behind Micro Scrubber.
Get up to 60 minutes of run time, multiple recharges per day and a lighter-weight micro floor scrubber by adding on the recommended, but optional, lithium-ion battery.
Change the squeegee and brush in seconds — no tools required.

CLEANING PATH 15 IN / 380 MM
SOLUTION TANK CAPACITY 2.5 GAL / 9.5 L
MAIN DOWN PRESSURE UP TO 38 LB / 17 KG

Application: Indoor
Cleaning Path: 15 in / 380 mm
Estimated Run Time: Up to 1 hour
Machine Type: Walk-Behind
Pad RPMs: Up to 900 rpm
Recovery Tank Capacity: 3.4 gal / 12.9 L
Solution Tank Capacity: 2.5 gal / 9.5 L
Squeegee Width: 17.5 in / 440 mm

Charger type: Off-board
Estimated Coverage/Productivity: Up to 14875 sq ft / 1380 sq m
Head Type: Cylindrical
Main Down Pressure: Up to 38 lb / 17 kg
Power Source: Battery
Service Plans: Gold, Silver, Pay as You Go, Block of Time
Sound Level: As low as 68 dBA

Technical Specifications