Yes, all automobile batteries can be charged.
An electric car needs to be charged until the indicator on the charger says the batteries are charged. It will depend on the amperage of the batteries, the way the charging mechanism works, and the percentage of discharge of the batteries.
12.6 volts when fully charged.
No, car batteries use lead for both plates. When charged the positive plate becomes white lead oxide.
Car batteries are seldom charged by solar energy. Normally, they are charged by the engine of the car, which powers an alternator, providing electrical power.
Not fully, but these days come more than half charged, yes.
They can be charged instead of using gas. considered eco-friendly
Because the alternator keeps the battery charged when the car is running.
Between 12V-14.2V is recommended, however standard charging units will optimize their charge to your batteries needs.
to vent the Hydrogen gas that is produced when the battery is being charged.
Shouldn't be since possibility always exists for explosion.
When lead/ acid batteries are charged, they can give off hydrogen gas.
Since one purpose of the alternator/generator is to keep the battery charged, yes.