Have had occasional issues with my Maserati ( 3 litre petrol ) Ghibli with unexplained battery leakage. This unit arrived with around 25% charge, but became fully charged and operational within 2 hrs using the supplied USB cable. Happy to report that once connected she fired up immediately. Obviously only just got it and used it once, but my early opinion is that it is a great piece of kit. Small enough to store in its supplied pouch in a reasonable sized glovebox, it could save loads of grief waiting for a recovery service. Build quality is impressive. I’m delighted with my purchase, and accordingly would recommend to anyone.