A lot of hot air about nothing

The device does not fulfill its main function (jump start). At three vehicles (3 liter 6-cylinder petrol engine and 1.8-liter 4-cylinder gasoline engine) I could test the device. The batteries of two vehicles still had about half their capacity, but not enough to start the engine. I closed the APA 16547 Power Pack, but nothing changed, the cars did not jump at :-(
The third vehicle (3L gasoline) was the battery completely empty and I test the totally skeptical APA 16547 PowerPack also in this car upps who jumped on ???
Now I took a fully charged battery from another vehicle and took advantage of this with conventional jumper cables on the first two vehicles and jumped immediately :-)

Conclusion: The APA 16547 Power Pack automatically shuts likely when you start, but the turn is so low that the switching does not work at too high a residual capacity of the discharged battery.