I ordered in October of this device on a different platform. Of course, the device immediately hung on the wall socket for charging. Since then, this is now more than half a year ago, I have thus started 4 cars, made several attempts to 12V power base and soldered several cables directly to my car stereo with a hand wand soldering iron. (He has 30 watts)
After these six months and the first charge of the battery still had a voltage of 12.5 volts. I have the battery the first hung again on the power after half a year ...
A super device that can also be used often times without having to be pre-loaded in between have.