My Ebay power inverter find fix HD

Even though there was not much to do I MANAGED TO DIAGNOSE AND FIX THIS POWER INVERTER AND ENDED UP GETTING A 1500WATT 230VOLT INVERTER WORTH £150 FOR £25 Admitting after making the video i noticed that the battery terminals was not tightening right down there was a gap on one of about 2mm and another one about 1mm but the other two terminals was okay i just had to do some jiggery-pokery to level them all up that took about 30 mins