I own a maintenance charger (named by the manufacturer) with a plug power supply on one side and a plug for the cigarette lighter on the other side. It also works, but unfortunately not as described in the user manual and expected of me. Because it does not shut down when a charging closing tension is reached, but continues to march until I get too much at 16 volts and plug it off. I can’t use it now unattended, like I thought. Since a return is not possible, I now try to find out what is wrong with it and I came across a component inside that I do not (yet) know. On the attached image it is the brown part that looks like a capacitor (but no one can be because the entire charging current flows through) and is labeled “PS” on the circuit board. PS as a designation for an electronic component doesn’t tell me anything. Maybe it’s a kind of thermal protection?