+ Fits well into the cigarette lighter (Golf 4) and can be easily removed
+ Gold-plated contacts
+ USB cable have good, tight fit in the adapter
+ No disturbance of the radio reception (other chargers sprinkle some HF, and the radio reception is poor)
+ Can remain plugged in when not in use (3-4 mA current to flow in standby, which is less than the self-discharge of the car battery)
+ Provides more than 500 mA current at both outputs simultaneously (tested with Motorola Defy and Motorola Razr I)
+ Motorla Razr I can be charged simultaneously and be used as a navigation system, so it should also be possible with other phones EC S3 and S4
+ Adapter will flow barely warm during operation, even if 1 A at 12 V (nearly 2 A at 5 V) (30 min tested)
- No LED (would be nice to find their way in the dark The USB jacks to)
- USB connectors are very close together, so the cables must not be thicker than a standard cable
Details of my tests:
Radio interference: set and tested whether under different load conditions of the reception is poor with poor reception in the underground radio stations (not at my old adapter is the case, the HAMA)
Current test: I have the power of the 12 V power source measured. At idle (without a connected device) a current of 3.3 mA. With this, it would take 10,000 hours or more than 1 year, up a car battery would be empty. Under different load conditions flowed at me up to 1.0 A at 12 V. Thus an adapter between have 70% -80% efficiency, so that you have a current at 5 V output of about 1 A * 12 V / 5 V * 75% = 1.8 A can be estimated. My two Motorola devices are sorted by max. 850 mA current consumption indicated (2 * 850 mA = 1.7 A). This shows that this adapter provides the maximum power. (The devices were loaded at 50% battery, GPS and ran a benchmark congested from the CPU, so that probably the maximum current is required.) The device is specified that it can withstand between 12-16 V and max 1:22 A required.
Iphone tests are still pending, I have unfortunately just none available. But for Motorola devices the charging adapter is ideally suited.
Because the negatives are probably a matter of taste, I prefer it from no star. Specifications, quality and functionality are in my opinion, exemplary. I would recommend a purchase.
PS: Important for high charge currents is a "good" cable, the cable 49 cent "from the Internet" often have a bad internal resistance and can not transport 1 A current.
