It has become the standard and has been so for over 50 years. It was 6 volts in up until the late 50s.
12V
NO, voltage of the charger must match the battery voltage.
12v
12V 5Ah
Voltage is the same but amp hour capacity of the car battery is much higher.
If the 12 volt solar panel output voltage is always higher than the 6.5 watt battery voltage. To charge a battery, a voltage greater than the battery must be applied to the battery, otherwise the battery will try to charge the charger.
Usually 6v, can be 12v.
It is not recommended to recharge a 3V battery with a 12V charger as this may damage the battery. The voltage of the charger should match the voltage of the battery to avoid overcharging and potential safety hazards. It is best to use a charger specifically designed for the 3V battery.
A == B (- 12V +) (- 12V +) (- 12V +) A single 12V battery in series with 4x 12V batteries connected in parallel... Total voltage from A to B is 24 volts! Note that the single battery in series will limit the total current capacity to that of a single battery.
You can replace a battery with a battery of the same voltage but greater capacity as long as it will physically fit.
It can be charged to approximately 13.9 volts.
The amperage of a 12V battery depends on its capacity, which is measured in ampere-hours (Ah). To calculate the amperage, you would divide the capacity (Ah) by the voltage (V). For example, a 12V battery with a capacity of 100Ah would have an amperage of 8.33A (100Ah / 12V).