Battery tester turned project?

I have a spare Midtronics JDT 1 battery tester that's faulty at actually doing it's job, so we shelved it.

Under the hood I know it's some sort of android tablet. My boss has given me the go ahead to see if I can run Doom on it.

I see a micro usb port on it, what would be my first step in finding more information and possible entry points?