Cheaper you can not load its battery

Who wonders why the part is as low: it creates only 0.3A (max.), Thus the device can be built cheaper: Weaker transformer, stripping weaker, weaker backups, less complex cooling ... The downside is that charging an empty car battery lasts longer. Who it comes to fast loading, taking a charger creates several amperes. Who wants only from time to time to reload its battery because the car is barely moving or even permanently will automatically reload, is the part on the safe and favorable side.

The load curve is true on as indicated at 13.8V to trickle charging, have been measured there.

What bothers: The somewhat thin cable. Electric power alone sufficient for the weak current but mechanically but a bit thin, even remained drann hanging or more times and handled are then soon brittle, a little longer they could be.