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Since this question is in the car battery category I am going to make a couple of assumptions:Most 1960 vintage and older automobiles were equipped with a six volt battery, the minimum usable voltage of these batteries is 6.1 volts fully charged is 6.6 voltsMost 1960 and later automobiles are fitted with a 12 volt battery, minimum usable voltage is about 12.1 volts, fully charged is around 13.2 volts
A 3 volt battery is a battery that produces 3 volts. Many watch batteries produce 3 volts.
No, an automobile battery charger outputs 12 Volts. This is far too many volts to charge a 5 Volt battery. You would destroy the 5 Volt battery with this charger.
No. It requires more that 8.4 volts to charge a 8.4 volt battery. If the 8.4 volt battery is discharged to less than 7.2 volts then it might charge up to 7.2 volts but no higher. Once the voltages are the same then current stops flowing and charging stops.
24 volts (although you'll ruin the 12v battery this way). If you're trying to get 36 volts, you want to wire them in series.
One is 9 volts and the other is 12 volts. They do not interchange!
Volt
1.5 volts
It will be a 12 volt battery.
A fully charged 12 volt battery will output 12.6 volts are read with a digital volt meter.
It is a 12 volt battery. Fully charged it will read 12.6 volts with a digital volt meter.
12 volts