Super idea - implementation flawed

In principle, anyone who has ever tangled in cable undergrowth, be thrilled when he learns
that the car charger cable has a retractable cord and is suitable for 12 and 24 volts.
I was there also and am still convinced of the overall concept.
However, the article description is a catch:
This product should not be used for a Samsung Galaxy II, if you want to run alongside in continuous use the smartphone.
While browsing (with NAVIGON) I realized that a four-hour drive was sufficient to bring about the prompt to "recharge the batteries".
How So?
After some searching I found the probable solution:
The original cable SAMSUNG give off a charging current of 700mA, while the car charger cable used here can accommodate a maximum of 500 mA to flow.
So unfortunately only conditionally fit.
Too bad, I just hope that there is a successor ...