I have a car battery charger (for 6 or 12 volt batteries), that I dont know for sure if it works or not. I want to use it for a power supply in an electrolytic cell, so I decided to test it out to see if it worked. When I hook it up and plug it in, nothing happens, the needed doesnt jump on the amp meter which is built into the case, nothing happens in my cell, so I am not even sure if it is working. But then again, it could be one of those "smart" battery chargers that can tell when the battery is fully charged and automatically shuts off, and maybe it thinks my "battery" is charged. Or, perhaps the resistance in the cell is so low that it is shorting it out and it automatically turns itself off to prevent damage. The again, it could just be broken. I dont have any car batteries to test it out on. What characteristics does the battery charger use to determine if thr battery is completely charged or not, high resistance, low resistance, something else? My battery charger has two settings, one to charge 6 volt batteries and one to charge 12 volt batterues, but it is suppose to put out 6 amps on both. Is this an ideal case, and in reality, I will never get that? Or can I expect to really get 6 amps out of the charger when I plug it in. I used to use computer power supplies as a power source, they claim to be x volts at y amps, but it never lives up to its promist, is this the same case?