After a short delivery time, I could try the rapid charger in your car. I plugged in the charger for my Samsung Galaxy S4 to an output of Quick Ader and have used the navigation of my cell phone for about 30 minutes. The power of a port has made the operation plus 1% charge. I have now a double-USB cable concerned to simply Micro plug and will try both jacks the quick Ader to operate with my phone (full 6 Amp) and will see whether a larger charge in addition to the operation is possible (should be practicable) ,
Conclusion: I can only advise everyone to a rapid charger with a minimum of 6 Amp to buy. Everything is weaker, sucking the cell phone battery is empty.