Car Battery Charger Schematics

How do i hook up this circuit, if still possible?

Situation: I have a small car audio amplifier I in my room running off a car battery charger 12V, the amplifier uses 5 amps for max volume i use max. now his winter the battery charger must be ready to use and i cannot use my system to make the move. I'm in class electronics and know a bit parallel set battle, but can use multiple wall chargers u like phone chargers and make a parallel circuit to a range of 12 to 14 volts 6.4 amp performance if I can still use my amp 1) 3.7V 350mA plug 2) 9v 200mA plug 3) 5.1V 700mA sheet 4) 5V 1A Sheet 5) 5V 850mA Sheet 6) 7.2V 200mA plug 7) 9v 500mA plug if you can make a circuit with one of these can u post a link and a schema that schema? thanks

You can not quite

1500 Watt Power Inverter with Charger and Built-in Transfer Switch by AIMS