Yes!!!
Except for Hybrid vehicles which are high voltage and really old cars (pre 1950's) which could be 6 or 8 volt.
how Can you charge multiple 12 volt batteries with a car?
The charger needs to be set to charge for the voltage that the battery is designed to produce. Most car batteries are 12 volt batteries.
Modern automobile batteries are 12 volts.
Automobile batteries today are all 12 volt. Most auto manufacutures switched from 6 volts to 12 volts in the 50s.
There are 6 volt car batteries, but you are only likely to encounter them in really old cars, like late 50s early 60s.
Most car batteries are 12 volts. They can light 12 volt bulbs. The bulbs in your house are likely 120 volt bulbs. A car battery will not light those without some very special equipment, or unless you were to wire ten car batteries in series.
They are powered by a normal 12 volt car battery.
To get 24 volts from two 12 volt batteries, hook the positive post from one battery to the negative post of the other.
No, auto batteries are DC not AC.
You cannot use a 12 volt charger to charge 2.6 volt batteries. The 2.6 volt batteries will become hot, very quickly, and explode.
A twelve volt charger will charge twelve volt batteries only unless it has a feature that allows you to change the chargers voltage. But on fast or slow charge 12 volts is 12 volts so most 12 volt chargers are only good for 12 volt batteries.
Depends on the battery size. If your boat is a 12 volt system and you wire two 12 volt batteries in series you then have 24 volts. If the batteries are 6 volt batteries you will be fine. If you have a 12 volt system on your boat and want to use two batteries then wire two 12 volt batteries in parallel. You will still have 12 volts but will have double the amperage available and this will extend the running time of the batteries.