Comments on: How many Volts, Watts, and Amps are in the Average Car Battery?

By: Engraved Zippo Lighters

Engraved Zippo Lighters — Wed, 18 Jan 2012 07:41:25 +0000

Engraved Zippo Lighters…

[...]How many Volts, Watts, and Amps are in the Average Car Battery?[...]…

By: scrubbag

scrubbag — Sun, 07 Mar 2010 13:03:59 +0000

Most car batteries are called 12 volt, although when running, can go as high as 14 volts. But the battery is still called a 12 volt system.
Amps are the driving force, and battery amperage can be as low as 200 amps for small cars, to maybe 1000 amps, for larger vehicles. The amps come into play when starting a vehicle, which can take 200 amps or more just to start, then the amperage drops and maintains a lower level, and the alternator keeps making current to replace that which is used.
During cold periods, the batter loses power, such as at 0 degrees, it has half of its power. And when it gets colder, the battery loses even more power, that is why it is so much harder to start a car during the winter.
Suppose you had a real cold engine, which took five times more energy to turn over because of the cold, the oil is cold and the metal is cold and stiff. Add to that a battery with less then half the power because of the cold.
You see, that’s the problem. That is why batteries are rated at 550 amp/hour or higher, to allow for loss during cold periods. A 550 amphour battery would only have 250 amps at 0 degrees temperature.

Watts are amount of power used, and is figured by mulitplying the volts times the amps. So if a car is using 5 amps, at 12 volts, to run the headlights, it is using 60 watts of power. (5 x 12). But most people think of batteries as amps and volts only, hardly ever think of watts. Headlights are rated at watts, such as high beam 55 watts, low beam 35 watts. So high beam would use close to 5 amps of amperage and low beams, about 3 amps., at 12 volts.
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By: gee-man

gee-man — Sun, 07 Mar 2010 12:30:59 +0000

500 cca
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By: Jim W

Jim W — Sun, 07 Mar 2010 12:21:59 +0000

Nominal 12 volts, actual at full charge is 14.4. The batteries are rated in Ampere hours of discharge time. Some are 700 + AH.
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By: Garrett

Garrett — Sun, 07 Mar 2010 11:32:59 +0000

Watts are associates with sound systems.

A car battery is advertised at 12 volts, but when new,should be 12.6 volts. Anything below 12.3v is bad, severity differs. Ive seen a battery at 0.02v in a shop car.
Amperage is the voltage that makes it through the resistance in the wires you use.
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Automotive Student

By: Karle

Karle — Sun, 07 Mar 2010 11:18:59 +0000

well it says on the side how many amps it has…usually hav about 14.5 volts…..and car batteries aren’t rated in watts…
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