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Usually a higher voltage will make a light bulb shine brighter; but if the voltage is too high, this can also destroy the light bulb.
The voltage required to counteract the self discharge of the battery at a certain temperature.So it is the amount of voltage given to make the battery in fully charged condition.
This doesn't make sense, "current" is "amperage" so the higher the voltage the lower the amperage, and the lower the voltage the higher the amperage.
It means that you have an alternator fitted. An alternator needs an amount of battery voltage to generate electricity. A generator/dynamo will make voltage without a battery being present.
It would need to be four times higher then the resistance that it is applied against. If the circuit is a 1 ohm resistor, then the voltage would need to be 4 Volts to make 4 amps.
Water or acid.
The replacement battery needs to have the same voltage as the original and the same connectors as the original (unless you want to do some soldering to make a proper connector). The replacement battery also needs to fit in the case. Handing a higher capacity battery should not be a problem if the above are satisfied.
Alessandro Volta
using it in a battery
If both batteries are of the same voltage (12 or 6) yes, you can use the charger. make sure that they are of the same voltage.
no it will only make the battery not charge
Yes, most leds will run on a 6v battery. Just look at the required voltage and make sure you don't exceed the maximum voltage. If the voltage is to high, find the correct resistor.