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There are many different sizes of Lead-Acid batteries and the voltage output can vary.
For example:
- Some security/alarm systems use Lead-Acid backup batteries which are either 6 Volts or 12 Volts.
- Similarly, emergency lights [like over doorways and hallways in commercial buildings, hospitals, etc.] use Lead-Acid backup batteries for powering the lights during power outages, and these can use either 6 or 12 Volt batteries.
- Most automobile batteries are 12 Volts.
- Some heavy vehicles [large trucks, heavy construction equipment vehicles, etc.] have 24 Volt batteries.
- Various aircraft use different voltage output batteries.
The output voltage is dependent on the number of "cells" in the battery. A fully charged Lead-Acid cell has an output of 2 Volts DC [Direct Current].
Therefore, if a battery has two cells, then the output voltage would be 4 Volts DC. If it has 3 cells, then the output voltage would be 6 Volts DC, and a battery with 6 cells would have an output of 12 Volts DC. And 24 Volt batteries have 12 cells.
That is the basics. Now, there is an exception.
IF the battery is "overcharged," then it can accumulate what is called a "surface charge" which goes slightly above the 12 Volt nominal output, and usually is about 1 extra volt, and that surface charge will "wither" away within a few minutes to an hour, even without using the battery. If the battery is used, then the surface charge is drained off immediately.
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∙ 14y ago
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