finally tried my Ring tyre infaltor today. Got to the office and the tyre pressure warning on wifes car came on. No power supply so set the pressures and the Ring inflated all 4 tyres which were low, back to the right pressures. Battery indicator has 4 ´´stripes´´ and after using it was down only 1. Pretty decent if you ask me. ...and i had used it before also on the old GSA battery which was dead and it fired up first time.
Just topping the charge back up to 4 bars to ensure its ready to go again. Great bit of kit!